This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Prophylaxis for migraine \nSelect and explain. \nA. Sumitriptan, B. Amytriptiline, C. Nifidipine, D. Diazepam', 'role': 'user'}, {'content': 'Answer: B \nExplanation: K.D Tripathy essentials of medical pharmacology 7th edition . *Drugs for prophylaxis of migraine are beta blockers(propranalol ),TCA(amitriptyline ), calciumchannelblockers(flunarizine),anticonvulsants (valproate),5HT antagonist. Ref Harrison20th edition pg 2234', 'role': 'assistant'}]