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: Pharmacology
Which of the following drugs inhibit 5'– deiodinase? 
Select and explain. 
A. Propylthiouracil, B. Methimazole, C. Lugol's iodine, D. Radioactive iodine
A: Propylthiouracil
Answer: A: Propylthiouracil 
Explanation: For the peripheral conversion of T1 to T3, the enzyme needed is 5'-deiodinase. It is inhibited by

Propylthiouracil
Propanolol
Amiodarone.