This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Selective alpha-2 antagonist 
Select and explain. 
A. Prazosin, B. Yohimbine, C. Tamsulosin, D. Phentolamine
B: Yohimbine
Answer: B: Yohimbine 
Explanation: .