A news agency publishes hundreds of articles daily. They want to automatically determine the main topics discussed in each article, such as 'politics', 'economy', or 'sports', without manually tagging them. The agency has no labeled training data. Which built-in Azure AI Language feature should they use?
Key phrase extraction extracts the main topics or key points from text without requiring training data.
Why this answer
Key phrase extraction is the correct choice because it automatically identifies the main topics or themes in a document without requiring any labeled training data. The news agency can use this built-in Azure AI Language feature to extract key phrases like 'politics', 'economy', or 'sports' from each article, enabling automatic topic categorization without manual tagging.
Exam trap
The trap here is that candidates often confuse key phrase extraction with named entity recognition, but NER extracts specific named entities (e.g., 'Microsoft', 'Seattle') rather than general topic phrases, making it unsuitable for identifying broad themes like 'politics' or 'sports'.
How to eliminate wrong answers
Option A is wrong because sentiment analysis determines the emotional tone (positive, negative, neutral) of text, not the main topics or themes discussed. Option C is wrong because named entity recognition identifies specific entities like people, organizations, and locations, but does not extract general topic labels or themes. Option D is wrong because language detection identifies the language of the text (e.g., English, Spanish), not the topics or subject matter within the document.