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
[{'content': 'Calcium Channel blocker with maximum effect on conduction in hea is - \nSelect and explain. \nA. Nifedipine, B. Diltiazem, C. Verapamil, D. Phenylamine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Verapamil", 'role': 'assistant'}]