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': 'Extremely lethal among all thyroid tumors is: \nSelect and explain. \nA. Medullary carcinoma., B. Papillary carcinoma., C. Anaplastic carcinoma., D. Follicular carcinoma.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]