This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
Drug used for both attack as well as prophylaxis of angina: 
Select and explain. 
A. Isosorbide dinitrate, B. Diltiazem, C. Verapamil, D. Dipyridamole
A: Isosorbide dinitrate
Answer: A: Isosorbide dinitrate 
Explanation: Ans. A. Isosorbide dinitrateIsorbide dinitrate is given for both acute attack as well as prophylaxis of angina, diltiazem is only used for prophylaxis. Dipyridamole worsens angina by coronary steal phenomenon.