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': 'Patient on Verapamil should not be given beta blocker to prevent: \nSelect and explain. \nA. Conduction block, B. Bronchospasm, C. Neurogenic shock, D. Anaphylaxis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Adverse effects of CCBs -\xa0Nausea, constipation and bradycardia are more common with Verapamil.\n\n\xa0Verapamil can accentuate conduction defect-should be avoided in 2nd & 3rd degree block, in sick sinus syndrome and along with beta-blocker.\n\xa0Most common side effects of DHPs are palpitation, flushing, hypotension, headache, ankle edema, drowsiness and nausea.\n\xa0Nifedipine can paradoxically increase the frequency of angina in some patients.\n\xa0Nifedipine can cause voiding difficulty in elderly (relaxant effect on the bladder) and glucose intolerance (decreases insulin release).', 'role': 'assistant'}]