Update app.py

app.py

@@ -95,7 +95,7 @@ def load_pdf(file_path):
 
 
 def load_chatbot():
-    return load_qa_chain(llm=openai.ChatCompletion.create(model="gpt-3.5-turbo-16k"), chain_type="stuff")
+    return load_qa_chain(llm=OpenAI(), chain_type="stuff")