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: Pharmacology
Which of the following drug is useful in prophylaxis of migraine? 
Select and explain. 
A. Propranalol, B. Sumatriptan, C. Aspirin, D. Ergotamine
A: Propranalol
Answer: A: Propranalol 
Explanation: Migraine: Propranolol is the most effective drug for chronic prophylaxis or migraine.​
Drug therapy of migraine