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 agina pectoris 
Select and explain. 
A. Verapamil, B. Diltiazem, C. Flunarizine, D. Amlodipine
C: Flunarizine
Answer: C: Flunarizine 
Explanation: Ref-KDT 6/e p172