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 these is a definitive treatment for  Gravae thyrotoxicosis? \nSelect and explain. \nA. Carbimazole, B. Sterioid, C. Hemithyroidectomy, D. Radioiodine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]