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
A cardiac patient must be asked to stop one of the following drugs when he is coughing a lot 
Select and explain. 
A. Diltiazem, B. Aspirin, C. Enalapril, D. Clopidogrel
C: Enalapril
Answer: C: Enalapril 
Explanation: None