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
[{'content': 'Among the folowing, which one is a Long acting Beta agonist? \nSelect and explain. \nA. Salbutamol, B. Propranolol, C. Salmeterol, D. Terbutaline', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Salmeterol', 'role': 'assistant'}]