Update app.py

app.py

@@ -72,7 +72,7 @@ if question:
     rag_chain = (
         {"context": retriever | format_docs, "question": RunnablePassthrough()}
         | prompt
-        | lambda x: x  # Replace with your LLM or appropriate function if needed
+        | llm  # Replace with your LLM or appropriate function if needed
         | StrOutputParser()
     )