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Which Langchain parameter must be set to True to receive source documents in RetrievalQA?

easy📝 Syntax Q12 of 15
LangChain - RAG Chain Construction
Which Langchain parameter must be set to True to receive source documents in RetrievalQA?
Areturn_source_documents
Binclude_metadata
Cshow_sources
Denable_citation
Step-by-Step Solution
Solution:

  1. Step 1: Recall Langchain RetrievalQA parameters

    The parameter to get source documents is return_source_documents.

  2. Step 2: Match options with correct parameter

    Only return_source_documents matches the exact parameter name used in Langchain.

  3. Final Answer:

    return_source_documents -> Option A

  4. Quick Check:

    Parameter for sources = return_source_documents [OK]
Quick Trick: Look for 'return_source_documents=True' in docs [OK]
Common Mistakes:
  • Using incorrect parameter names like include_metadata
  • Assuming show_sources or enable_citation exist
  • Confusing with unrelated parameters

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