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
Selective a1 - A blocker is - 
Select and explain. 
A. Prazosin, B. Terazosin, C. Tamsulosin, D. Indoramine
C: Tamsulosin
Answer: C: Tamsulosin 
Explanation: Ans. is 'c' i.e., Tamsulosin