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: Medicine
[{'content': 'The drug of choice for treatment of hyperthyroidism during lactation period is - \nSelect and explain. \nA. Carbimazole, B. Propylthiouracil, C. Methimizole, D. Radioactive iodine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]