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': 'Which of the following calcium channel blocker would be useful in the treatment of supra-ventricular tachycardia by suppressing AV node conduction ? \nSelect and explain. \nA. Amlodipine, B. Nimodipine, C. Verapamil, D. Nifedipine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Verapamil o Amongst calcium channel blockers, verapamil has the most prominent cardiac electrophysiological action.o CCBs primarily act on SA node and AV node (slow channel - Ca+2 channel action potential) -| automaticity in SA node and decreased conduction in AV node.", 'role': 'assistant'}]