Fix bugs in question answering function.

app.py

@@ -105,6 +105,7 @@ def create_question_message(item):
 
 async def answer_question(agent, item, answers_payload, results_log):
     task_id = item.get("task_id")
+    question_text = item.get("question")
     try:
         question_message = create_question_message(item)
     except ValidationError:
@@ -114,7 +115,7 @@ async def answer_question(agent, item, answers_payload, results_log):
         print(f"Skipping item with missing task_id: {item}")
         return
     try:
-        submitted_answer = await agent.run(question_message)
+        submitted_answer = await agent(question_message)
 
         answers_payload.append({"task_id": task_id, "submitted_answer": submitted_answer})
         results_log.append({"Task ID": task_id, "Question": question_text, "Submitted Answer": submitted_answer})