This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Verapamil is contraindicated in: \nSelect and explain. \nA. Hypeesion, B. Complete hea block, C. Paroxysmal supraventricular tachycardia, D. Angina pectoris', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Verapamil decreases the force of contraction, decreases hea rate, depresses SA node and slows down AV conduction.so, not used in complete hea block. CCBs and beta blockers have the synergistic effect They are individually or combined contraindicated in complete hea block Beta blockers are also contraindicated in complete hea block. REF.Essentials of Pharmacology KD Tripathi 8th ed.', 'role': 'assistant'}]