- A
Patient records (structured), DICOM files (structured), Clinical notes (unstructured)
Why wrong: DICOM files are not structured; they contain embedded metadata but are considered semi-structured.
- B
Patient records (structured), DICOM files (semi-structured), Clinical notes (unstructured)
Correct. Patient records are structured because they reside in a relational table with fixed columns. DICOM files have a standard format with metadata tags, making them semi-structured. Clinical notes as free text are unstructured.
- C
Patient records (semi-structured), DICOM files (unstructured), Clinical notes (structured)
Why wrong: Incorrect. Patient records are structured, not semi-structured. Clinical notes are unstructured, not structured.
- D
Patient records (unstructured), DICOM files (semi-structured), Clinical notes (structured)
Why wrong: Incorrect. Patient records are structured; clinical notes are unstructured.
Quick Answer
The correct classification from most structured to least structured is patient records (structured), DICOM files (semi-structured), and clinical notes (unstructured). Patient records in a relational database with fixed columns like PatientID and BloodType are structured data because they adhere to a rigid schema with defined data types, enabling straightforward querying. DICOM files are semi-structured because they combine a structured header of metadata tags—such as patient ID and study date—with an unstructured binary image payload, placing them between fully organized and free-form data. Clinical notes as free-text documents are unstructured data, lacking any predefined schema or organization, which makes them difficult to query without natural language processing. On the Microsoft Azure Data Fundamentals DP-900 exam, this question tests your ability to classify data types based on schema rigidity, a core concept for Azure data storage decisions. A common trap is assuming all medical files are unstructured; remember that DICOM’s metadata header gives it semi-structured status. Memory tip: think of a filing cabinet—structured data is labeled folders, semi-structured is folders with loose papers inside, and unstructured is a pile of random notes.
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A healthcare company stores patient records in a relational database with fixed columns (PatientID, Name, DOB, BloodType). Medical images such as X-rays are stored as DICOM files. Clinical notes are stored as free-text documents. Which of the following correctly classifies these data types from most structured to least structured?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Patient records (structured), DICOM files (semi-structured), Clinical notes (unstructured)
Patient records in a fixed-column relational database are structured data because they conform to a rigid schema with defined data types. DICOM files are semi-structured because they contain a structured header with metadata tags (e.g., patient ID, study date) alongside an unstructured binary image payload. Clinical notes as free-text documents are unstructured because they lack a predefined schema or organization, making them difficult to query without natural language processing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Patient records (structured), DICOM files (structured), Clinical notes (unstructured)
Why it's wrong here
DICOM files are not structured; they contain embedded metadata but are considered semi-structured.
- ✓
Patient records (structured), DICOM files (semi-structured), Clinical notes (unstructured)
Why this is correct
Correct. Patient records are structured because they reside in a relational table with fixed columns. DICOM files have a standard format with metadata tags, making them semi-structured. Clinical notes as free text are unstructured.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Patient records (semi-structured), DICOM files (unstructured), Clinical notes (structured)
Why it's wrong here
Incorrect. Patient records are structured, not semi-structured. Clinical notes are unstructured, not structured.
- ✗
Patient records (unstructured), DICOM files (semi-structured), Clinical notes (structured)
Why it's wrong here
Incorrect. Patient records are structured; clinical notes are unstructured.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often misclassify DICOM files as fully structured due to their standardized header, overlooking the unstructured binary image payload that makes them semi-structured.
Detailed technical explanation
How to think about this question
DICOM (Digital Imaging and Communications in Medicine) files use a standard that embeds metadata in a hierarchical tag-based format (e.g., (0010,0020) for Patient ID) within the file header, while the pixel data is stored as a binary blob. This hybrid nature places DICOM in the semi-structured category, similar to JSON or XML, but with a binary component. In real-world healthcare systems, extracting and querying DICOM metadata often requires specialized tools like DCMTK or PACS servers, whereas the binary image data requires separate processing for analysis.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DP-900 question test?
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Patient records (structured), DICOM files (semi-structured), Clinical notes (unstructured) — Patient records in a fixed-column relational database are structured data because they conform to a rigid schema with defined data types. DICOM files are semi-structured because they contain a structured header with metadata tags (e.g., patient ID, study date) alongside an unstructured binary image payload. Clinical notes as free-text documents are unstructured because they lack a predefined schema or organization, making them difficult to query without natural language processing.
What should I do if I get this DP-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This DP-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-900 exam.
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