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
[{'content': 'All of the following can can be used for prophylaxis of migraine except \nSelect and explain. \nA. Sumatriptan, B. Valproate, C. Propanolo, D. Topiramate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: sumatriptan is the drug of choice for acute severe migraine but it is not indicated for prophylaxis Refer katzung 11/e p283', 'role': 'assistant'}]