Update app.py

app.py

@@ -79,7 +79,7 @@ def ask_pdfs(user_question):
 
     # Create a question answering system based on information retrieval using the RetrievalQA class, which takes as input a neural language model, a chain type and a retriever (an object that allows you to retrieve the most relevant chunks of text for a query)
     retriever = VectorStoreRetriever(vectorstore=vector_store)
-    qa = RetrievalQA.from_llm(llm=llm, retriever=retriever)
+    qa = RetrievalQA.from_llm(llm=llm, retriever=retriever, return_source_documents=True)
     response =qa.run(user_question)
     #print("Response:",response)