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
Conversion of T4 to T3 is inhibited by all except. 
Select and explain. 
A. Propanolol, B. Propylthiouracil, C. Amiodarone, D. Methimazole
D: Methimazole
Answer: D: Methimazole 
Explanation: Methimazole and carbimazole do not inhibit peripheral conversion of T4 to T3. Prophythiouracil, carbimazole, methimazole are thioamides used in hypehyroidism but only PTU inhibits t4 to t3 conversion among thioamides (REF.Essential of medical pharmacology K D TRIPATHI 6 Edition, Page No - 250)