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': 'Treatment of choice for medullary carcinoma of thyroid is: \nSelect and explain. \nA. Total thyroidectomy, B. Partial thyroidectomy, C. 1131 ablation, D. Hernithyroidectomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]