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: Medicine
[{'content': 'Which of the following drugs should not be used in a setting of severe hypertension in elderly on empirical basis ? \nSelect and explain. \nA. Enalapril, B. Amlodipine, C. Chlorthiazide, D. Prazosin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]