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: Pharmacology
Which of the following is not a Ca++ channel blocker ? 
Select and explain. 
A. Enalapril, B. Nifedipine, C. Diltiazem, D. Verapamil
A: Enalapril
Answer: A: Enalapril 
Explanation: None