This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Selective beta 2 agonist is 
Select and explain. 
A. Isoprenaline, B. Pirbuterol, C. Dobutamine, D. Mirabegron
B: Pirbuterol
Answer: B: Pirbuterol 
Explanation: Pirbuterol is a beta 2 agonist like salbutamol used for COPD and asthma. Ref: KDT 6th ed pg 129-132