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
Centrally acting sympatholytic agent used as antihypertensive agent is: 
Select and explain. 
A. Propranolol, B. Clonidine, C. Prazosin, D. Phenoxybenzamine
B: Clonidine
Answer: B: Clonidine 
Explanation: None