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 are used in prophylaxis of migraine, except: 
Select and explain. 
A. Propanolol, B. Flunarizine, C. Tapiramate, D. Levetiracetam
D: Levetiracetam
Answer: D: Levetiracetam 
Explanation: Drugs approved by the FDA for migraine prophylaxis are propranolol, timolol, sodium valproate and methysergide. Other used drugs are amitriptyline, noriptyline, verapamil, phenelzine, gabapentine and cyproheptadine. Ref: Harrisons 16th Edition, Page 93 (table 14-11)