Propanolol is contra-indicated in a patient of angina pectoris who is already receiving:: (A) Nifedipine, (B) Aspirin, (C) Verapamil, (D) Isosorbide mononitrate
Answer is C. (Ref: KDT 6/e p530) Both verapamil and propanolol decrease the conduction through AV node and their concomitant use can result in hea block.