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: Medicine
[{'content': 'Drugs use for Prophylaxis of a migraine include the following except? \nSelect and explain. \nA. Sumitriptan, B. Valproate, C. Serotonergic drugs, D. TCAs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *TCA,beta blockers ,calcium channel blockers, valproate,topiramate , used for prophylaxis of migraine *Sumatriptan used for treatment of acute attack of migraine .', 'role': 'assistant'}]