This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Arrhythmias, Dyslipidemia, Subject name: Pharmacology
[{'content': 'Most common side effect of calcium channel blockers is \nSelect and explain. \nA. Nausea, B. Constipation, C. Postural hypotension, D. Headache', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Calcium channel blockers: Most common side effect is headache CCB cause flushing, headache, angioedema, reflex tachycardia. Verapamil, diltiazem- both vasodilation and decrease in hea rate Nifedipine, clevidipine - only vasodilation but increase in hea rate. Avoid in angina.', 'role': 'assistant'}]