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
All are antithyroid drugs except 
Select and explain. 
A. Propylthiouracil, B. Methimazole, C. Carbimazole, D. Carbamazepine
D: Carbamazepine
Answer: D: Carbamazepine 
Explanation: Carbamezapine is an anti epileptic drug. It belongs to iminostilbene group of drugs Carbimazole is used to treat hypehyroidism. Carbimazole is a pro-drugas after absorption it is conveed to the active form, methimazole. (REF.Essential of medical pharmacology K D TRIPATHI 6 Edition, Page No - 402)