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
All of the following agents are used for prophylaxis of migraine, Except: 
Select and explain. 
A. Propanalol, B. Valproate, C. Topiramate, D. Ethosuxamide
D: Ethosuxamide
Answer: D: Ethosuxamide 
Explanation: Ethosuximide is not used in the prophylaxis of migraine. It is used only in the treatment of absence seizures. Betablockers, calcium channel blockers, TCA, valproate and topiramate are used in migraine prophylaxis. Ref: Essentials of Medical Pharmacology By KD Tripathi, 5th Edition, Page 15; Current Management in Child Neurology By Bernard L Maria, Page 70, 71.