1Z0-1127-25 LangChain and AI Application Development Practice Question
A developer needs to build a chain that first summarizes a long document, then translates the summary into French. Which LangChain chain type allows executing these steps in sequence with the output of one step feeding into the next?
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
✓
SequentialChain
SequentialChain is designed to run multiple chains in order, where the output of each chain becomes input to the next. This fits the use case of summarizing then translating.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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RetrievalQA
Why it's wrong here
RetrievalQA is for question-answering over retrieved documents.
- ✓
SequentialChain
Why this is correct
SequentialChain chains multiple sub-chains, passing outputs as inputs to subsequent steps.
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LLMChain
Why it's wrong here
LLMChain only runs a single prompt+model combination.
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ConversationalRetrievalChain
Why it's wrong here
ConversationalRetrievalChain is for multi-turn QA with conversation history.
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