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
Which of the following is long acting sympathomimetics used in bronchial asthma ? 
Select and explain. 
A. Salbutamol, B. Terbutaline, C. Bambuterol, D. Salmeterol
D: Salmeterol
Answer: D: Salmeterol 
Explanation: None