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
Which of the following drug is used for prophylaxis of migraine? 
Select and explain. 
A. Diclofenac, B. Flunarizine, C. Sumatriptan, D. Dihydroergotamine
B: Flunarizine
Answer: B: Flunarizine 
Explanation: Drugs used in prophylaxis of migraine Propranolol/other beta blockers Amitriptyline/other tricyclic antidepressants Fluanarazine/other Ca2+ channel blockers Valproate/topiramate Methysergide/cyproheptadine Ref: KD Tripathi, Pg 169