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
Alpha blocker used as anti hypertensive agent 
Select and explain. 
A. Alpha methyl DOPA, B. Prazosin, C. Clonidine, D. Propranolol
B: Prazosin
Answer: B: Prazosin 
Explanation: None