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 one of the following is a relatively selective α2 adrenergic blocker with short duration of action ? 
Select and explain. 
A. Prazosin, B. Yohimbine, C. Terazosin, D. Doxazosin
B: Yohimbine
Answer: B: Yohimbine 
Explanation: None