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 drug is most likely to precipitate angina: \nSelect and explain. \nA. Diltiazem., B. Verapamil., C. Amlodipine., D. Nifedipine.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]