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': 'Conversion of T4 to T3 is inhibited by all except \nSelect and explain. \nA. Propanolol, B. Propylthiouracil, C. Amiodarone, D. Methimazole', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Refer KDT 6/e p250 Methimazole inhibits only thyroid peroxidase whereas propylthiouracil inhibits thyroid peroxidase as well as 5-deiodinase. Later is involveed in peripheral conversion of T4 to T3', 'role': 'assistant'}]