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': 'Which of the following is a very long acting Beta 2- agonist \nSelect and explain. \nA. Salbutamol, B. Terbutaline, C. Indacterol, D. Salmeterol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Salbutamol, Terbutaline are short acting Beta 2 agonists.\nSalmeterol, Formeterol are long acting Beta 2 agonists.\nIndacterol, Carmoterol, Olodlaterol are very long acting Beta 2 agonists.', 'role': 'assistant'}]