This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'All are dihydropyradines except \nSelect and explain. \nA. Nifedipine, B. Nimodipine, C. Verapamil, D. Felodipine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Refer kDT 6/e p530 Dihydropyridine (DHP) is a molecule based upon pyridine, and the parent of a class of molecules that have been semi-saturated with two substituents replacing one double bond. They are paicularly well known in pharmacology as L-type calcium channel blockers, used in the treatment of hypeension. Verapamil is a calcium channel blockers', 'role': 'assistant'}]