This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': "Which of the following drugs inhibit 5'-deiodinase? \nSelect and explain. \nA. Propylthiouracil, B. Methimazole, C. Lugol's iodine, D. Radioactive iodine", 'role': 'user'}, {'content': "Answer: A \nExplanation: (Ref: KDT 6/e p249, 250) For the peripheral conversion of T4 to T3 the enzyme needed is 5'-deiodinase. It is inhibited by Propylthiouacil, Propanolol, Amiodarone.", 'role': 'assistant'}]