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
Long acting b2 sympathomimetic ? 
Select and explain. 
A. Salmeterol, B. Orciprenaline, C. Penoterol, D. Pexbaterol
A: Salmeterol
Answer: A: Salmeterol 
Explanation: Ans. is 'a' i.e., Salmeterol o b2-agonistsused in Asthma 1.Sho acting --> Salbutamol, terbutaline 2. Long acting --> Salmeterol, formoterol