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': 'Thyroid storm after operation is due to - \nSelect and explain. \nA. Inadequate control of hyperthyroidism, B. Massive bleeding, C. Recurrent laryngeal nerve injury, D. Postoperative infection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]