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 not a bronchodilator? \nSelect and explain. \nA. b 2 agonist, B. Methylxanthines, C. Steroids, D. Anticholinergic', 'role': 'user'}, {'content': "Answer: C \nExplanation: ANSWER: (C) SteroidsREF: KDT's 6th edition page 217Repeat from June 2009Bronchodilators:Three groups of drugs which acts as bronchodilators are: (Mnemonic: SAM)Sympathomimetics:Non selective b2 agonists like adrenaline, isoprenaline and ephedrineShort acting Selective b2 agonists like salbutamol, Terbutaline. pirbuterol, metaprotrenolLong acting Selective b2 agonists like Salmeterol, Bambuterol, FormoterolAnticholinergics: Ipratropium, TiotropiumMethylxanthines: Caffeine, Theophylline, Aminophylline, Theobromine", 'role': 'assistant'}]