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
Which of the following chugs should NOT be used in setting of severe hypertension in elderly on empirical basis? 
Select and explain. 
A. Enalapril, B. Amlodipine, C. Chlorthiazide, D. Prazosin
D: Prazosin
Answer: D: Prazosin 
Explanation: None