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
Most important drug used in the treatment of coronary artery disease is 
Select and explain. 
A. Aspirin, B. Digoxin, C. Streptokinase, D. Nifedipine
A: Aspirin
Answer: A: Aspirin 
Explanation: None