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: Medicine
[{'content': 'Which beta 2 agonist is not given for acute bronchial asthma \nSelect and explain. \nA. Salbutamol, B. Terbutaline, C. Salmeterol, D. Methyl xanthine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Long acting beta 2 agonists (Formoterol,\xa0Salmeterol,\xa0Arformoterol,\xa0Carmoterol) should not be used in case of acute asthma as\xa0monotherapy\xa0(increased mortality).', 'role': 'assistant'}]