This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Antithyroid drug of choice in pregnancy - \nSelect and explain. \nA. Carbimazole, B. Iodine therapy, C. Propylthiouracil, D. Metimazole', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Propylthiouracil o Both carbimazole and propylthiourcil can be used during pregnancy, but propyl-thiouracil is the drug of choicebecause its greater protein binding allows low doses of propylthioracil to be transferred across the placenta and therefore less chance of hypothyroidism.", 'role': 'assistant'}]