Question related to LangChain Master Class

I’m watching the LangChain Master Class video: https://www.youtube.com/watch?v=yF9kGESAi3M&ab_channel=codewithbrandon, and I’m a bit confused about how we create rag_chain using rag_chain = create_retrieval_chain(history_aware_retriever, question_answer_chain) in 7_rag_conversational.py. Couldn’t we just use create_history_aware_retriever to retrieve the information?

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