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
Prophylaxis for migraine - 
Select and explain. 
A. Sumitriptan, B. Amytriptiline, C. Nifidipine, D. Diazepam
B: Amytriptiline
Answer: B: Amytriptiline 
Explanation: None