This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Asthma, Subject name: Pharmacology
[{'content': 'Vilanterol is FDA approved for treatment of: \nSelect and explain. \nA. Asthma, B. COPD, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. COPDVery long Acting Beta2 Agonists (VLABA) are approved only for treatment of COPD. The drugs in this class area. Olodaterolb. Vilanterolc. Carmoterold. Indicaterol', 'role': 'assistant'}]