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 carcinoma shows good response to radioiodine: \nSelect and explain. \nA. Papillary carcinoma., B. Follicular carcinoma., C. Anaplastic carcinoma., D. Medullary carcinoma.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]