Conversion of T4 to T3 is inhibited by all except: (A) Propanolol, (B) Propylthiouracil, (C) Amiodarone, (D) Methimazole
Answer is D. 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