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': 'Therapy of choice for diffuse toxic goiter in a patient over 45 years - \nSelect and explain. \nA. Surgery, B. Antithyroid drugs, C. Radio iodine, D. Antithyroid drugs first followed by surgery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]