This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
Zafirlukast used in asthmatic patients acts by 
Select and explain. 
A. Phosphodiesterase inhibition, B. Endothelium receptor blockage, C. Leukotriene receptor blockage, D. Lipoxygenase inhibitor
C: Leukotriene receptor blockage
Answer: C: Leukotriene receptor blockage 
Explanation: Drugs for Bronchial AsthmaMechanism of actionDrugsBronchodilators b2 sympathomimetics Salbutamol, Terbutaline, Bambuterol, Salmeterol, Formoterol, Ephedrine Methylxanthine Theophylline, Aminophylline, Choline theophyllineAnticholinergics Ipratropium bromide, Tiotropium bromide Leukotriene antagonist Montelukast, Zafirlukast Mast cell stabilizers Sodium cromoglycate, Ketotifen Coicosteroids Systemic Hydrocoisone, Prednisolone Inhalational Beclomethasone, Budesonide, Fluticasone, Flunisolide, Ciclesonide Anti IgE antibody Omalizumab (Refer: Rang and Dale's Clinical Pharmacology, 7th edition, pg no: 345)