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
Calcium Channel blocker with maximum effect on conduction in hea is - 
Select and explain. 
A. Nifedipine, B. Diltiazem, C. Verapamil, D. Phenylamine
C: Verapamil
Answer: C: Verapamil 
Explanation: Ans. is 'c' i.e., Verapamil