This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Leukotriene receptor antagonist used for bronchial asthma is : 
Select and explain. 
A. Zafirlukast, B. Zileuton, C. Cromolyn sodium, D. Aminophylline
A: Zafirlukast
Answer: A: Zafirlukast 
Explanation: Montelukast, zafirlukast and pranlukast are Cys-LT1 receptor antagonists.
Zileuton inhibits the production of leukotrienes by inhibiting the enzyme 5-lipoxygenase.