This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Hypertensive, Subject name: Pharmacology
[{'content': 'Which of the following is a cerebro selective calcium channel blocker? \nSelect and explain. \nA. Nimodipine, B. Ziconotide, C. Verapamil, D. Diltiazem', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) NimodipineRef KDT 6/e, p 172', 'role': 'assistant'}]