This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
Which of the following drugs is used for the prophylaxis of migraine but not for angina pectoris 
Select and explain. 
A. Verapamnil, B. Diltiazem, C. Flunarizine, D. Amlodipine
C: Flunarizine
Answer: C: Flunarizine 
Explanation: Ref -KDT 6/e p172 Flunarizine, sold under the brand name Sibelium among others, is a drug classified as a calcium antagonist which is used for various indications. It is not available by prescription in the United States or Japan. The drug was discovered at Janssen Pharmaceutica in 1968