<prompt> Leukotriene receptor antagonist used for bronchial asthmaZafirkulastZileutonCromolyn SodiumAminophylline  <response>: 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 