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': 'Leukotriene receptor antagonist used for bronchial asthma is: \nSelect and explain. \nA. Zafirlukast, B. Zileuton, C. Cromolyn sodium, D. Aminophylline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Zafirlukast(Ref: KDT 8th/e p248)Montelukast, zafirlukast and idalukast are Cys-LT1 receptor antagonists.Zileuton inhibits the production of leukotrienes by inhibiting the enzyme 5-lipoxygenase.', 'role': 'assistant'}]