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': 'Preoperative medication of thyrotoxicosis are all except? \nSelect and explain. \nA. PTU, B. Carbimazole, C. Propranolol, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Prevention of thyroid storm should be started add.', 'role': 'assistant'}]