This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
[{'content': 'Leukotriene receptor antagonist used for bronchial asthma \nSelect and explain. \nA. Zafirkulast, B. Zileuton, C. Cromolyn Sodium, D. Aminophylline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer KDT 6 /e p 222 Montelukast, zafirlukast and idalukast are Cys-LT, receptor antagonist Zileuton inhibits the production if Leukotriene by inhibiting the enzyme 5-lipoxygenase', 'role': 'assistant'}]