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 as ? \nSelect and explain. \nA. Conduction block, B. Bronchospasm, C. Neurogenic shock, D. Anaphylaxis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Conduction block Adverse effects of CCBs Nausea, constipation and bradycardia are more common with verapamil. Verapamil can accentuate conduction defect-should be avoided in 2nd & 3rd degree block, in sick sinus syndrome and along with 13-blocker. Most common side effects of DHPs are palpitation, flushing, hypotension, headache, ankle edema, drowsiness and nausea. Nifedipine can paradoxically increase the frequency of angina in some patients. Nifedine can cause voiding difficulty in elderly (relaxant effect on bladder) and glucose intolerance (decreases insulin release).", 'role': 'assistant'}]