Which medication is an example of a leukotriene receptor antagonist?

The correct choice, Singulair, is an example of a leukotriene receptor antagonist because it specifically works by blocking the action of leukotrienes, which are inflammatory mediators involved in the pathophysiology of asthma and allergic rhinitis. By antagonizing the leukotriene receptors, Singulair helps to relax bronchial smooth muscle, reduce inflammation, and decrease mucus production, thereby improving respiratory function in patients with these conditions.

Other medications in the list serve different roles in respiratory therapy. Albuterol is a short-acting beta-agonist that primarily works as a bronchodilator, providing rapid relief from acute bronchospasm. Ipratropium bromide is an anticholinergic agent used to reduce bronchoconstriction and mucus secretion but does not target leukotriene receptors. Prednisone is a corticosteroid that reduces inflammation but acts through a different mechanism, primarily by suppressing the overall immune response and inflammatory processes rather than specifically blocking leukotriene receptors.