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
Propranolol is C/I in a patient of angina who is already receiving 
Select and explain. 
A. Nifedipine, B. Aspirin, C. Verapamil, D. Isosorbide mononitrate
C: Verapamil
Answer: C: Verapamil 
Explanation: 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.