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': 'Iodine deficiency or goitrogenic drugs administered over a long period may produce: \nSelect and explain. \nA. Follicular carcinoma., B. Medullary carcinoma., C. Papillary carcinoma., D. Anaplastic carcinoma.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]