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': 'Maximum incidence of impotence is seen with the following anti–hypertensive agent: \nSelect and explain. \nA. CCBs, B. Beta blockers, C. ARBs, D. ACE inhibitors', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]