This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Propranolol is C/I in a patient of angina who is already receiving \nSelect and explain. \nA. Nifedipine, B. Aspirin, C. Verapamil, D. Isosorbide mononitrate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: propranolol is a beta blocker and verapamil is a calcium channel blocker both given in combination can cause decrease in hea rate drastically hence contraindicated. Ref: KD Tripathi 8th ed.', 'role': 'assistant'}]