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
All of the following drugs can be used for the prophylaxis of migraine except - 
Select and explain. 
A. Propranolol, B. Sumatriptan, C. Amiitriptyline, D. Flunarizine
B: Sumatriptan
Answer: B: Sumatriptan 
Explanation: None