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
[{'content': 'Selective beta 2 agonist is \nSelect and explain. \nA. Isoprenaline, B. Pirbuterol, C. Dobutamine, D. Mirabegron', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pirbuterol is a beta 2 agonist like salbutamol used for COPD and asthma. Ref: KDT 6th ed pg 129-132', 'role': 'assistant'}]