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 la blocker ? 
Select and explain. 
A. Tamsulosin, B. Prazocin, C. Terzocin, D. Clonidine
A: Tamsulosin
Answer: A: Tamsulosin 
Explanation: Ans. is 'a' i.e., Tamsulocin