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 asthama is \nSelect and explain. \nA. Zafirlukast, B. Zileuton, C. Cromolyn Sodium, D. Aminophylline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Examples for leukotriene receptor antagonist are Montelukast and Zafirlukast ESSENTIALS OF MEDICAL PHARMACOLOGY 8TH EDITON Page No :222', 'role': 'assistant'}]