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': 'Montelukast is \nSelect and explain. \nA. Selective antagonists of leukotrienes receptor, B. Lipooxygenase inhibitor, C. H1 antagonist, D. H3 antagonist', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Montelukast and zafirlukast is selective antagonists of the CysLT1 receptor for leukotrienes. Competetively inhibit the bronchoconstictor effects of leukotrienes. Basic and clinical pharmacology Katzung 13th edition pg 324', 'role': 'assistant'}]