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 the heart is: 
Select and explain. 
A. Nifedipine., B. Verapamil., C. Diltiazem., D. Phenylamine.
B: Verapamil.
Answer: B: Verapamil. 
Explanation: None