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': 'Which of the following is a long acting bronchodilator? \nSelect and explain. \nA. Salbutamol, B. Terbutaline, C. Adrenaline, D. Formoterol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Beta-2 agonists are well known bronchodilators. This includes:#Salbutamol, Terbutaline, Formoterol, Salmeterol, Indacaterol, Albuterol etc.Among these agents, formoterol, salmeterol, Indacaterol are longer acting analogue and are preferred in prophylactic therapy of bronchial asthma and COPD.', 'role': 'assistant'}]