This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Malignancies, Subject name: Surgery
[{'content': 'Which of the following is used in the treatment of well differentiated thyroid carcinoma - \nSelect and explain. \nA. Il31, B. 99m Tc, C. 32p, D. MIBG', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., I131", 'role': 'assistant'}]