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
Among the folowing, which one is a Long acting Beta agonist? 
Select and explain. 
A. Salbutamol, B. Propranolol, C. Salmeterol, D. Terbutaline
C: Salmeterol
Answer: C: Salmeterol 
Explanation: Salmeterol