This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, Subject name: Pharmacology
All of the following can can be used for prophylaxis of migraine except 
Select and explain. 
A. Sumatriptan, B. Valproate, C. Propanolo, D. Topiramate
A: Sumatriptan
Answer: A: Sumatriptan 
Explanation: sumatriptan is the drug of choice for acute severe migraine but it is not indicated for prophylaxis Refer katzung 11/e p283