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': 'The commonest thyroid malignancy is \nSelect and explain. \nA. Anaplastic, B. Follicular, C. Papillary, D. Medullary', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]