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
Beta 2 agonist used in rescue therapy in acute respiratory conditions are all except - 
Select and explain. 
A. Terbutaline, B. Salbutamol, C. Bambuterol, D. Ketotifen
D: Ketotifen
Answer: D: Ketotifen 
Explanation: Ans. is 'd' i.e., Ketotifen BronchodilatorsDrugs reducing inflammationa) b2 SympathomimeticsLeukotriene antagonistsMast cell stabilizersCorticosteroidsAnti-IgE antibodyo Salbutamolo Terbutalineo Montelukasto Sodium cromoglycatea) Systemico Omalizumabo Bambuteralo Salmeterolo Zafirlukasto Ketotifeno Hydrocortisone o Formoterolo Ephedrine o Prednisolone b) Inhalation b) Methylxanthines o Beclomethasome o Theophyllineo Aminophylline o Budesonide o Doxophylline o Fluticasone c) Anticholinergics o Flunisolide o Ipratropiumo Tiopratropium o Ciclesonide