This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Which of the following is used in the treatment of differentiated thyroid cancer \nSelect and explain. \nA. 131I, B. 99mTc, C. 32P, D. 131I-MIBG', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 131I can be used for scanning for metastasis from differentiated thyroid cancers as well as for the ablation of differentiated thyroid cancer cells.', 'role': 'assistant'}]