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
Drugs used in migraine prophylaxis are all except : 
Select and explain. 
A. Flunarizine, B. Propranolol, C. Cyproheptadine, D. Sumatriptan
D: Sumatriptan
Answer: D: Sumatriptan 
Explanation: None