Question: A 24-year-old man presents to his family practitioner for a routine asthma follow-up. He is currently on albuterol, corticosteroids, and salmeterol, all via inhalation. The patient is compliant with his medications, but he still complains of episodic shortness of breath and wheezing. Since his last visit, the peak expiratory flow (PEF) has improved, but it is still less than the ideal predicted values based on age, gender, and height. Montelukast is added to his treatment regimen. What is the mechanism of action of this drug? A. Inhibits the release of inflammatory substances from mast cells B. Binds to IgE C. Activates adrenergic receptors on bronchial smooth muscle D. Blocks the receptor of an arachidonic acid metabolite E. Inhibits lipoxygenase, decreasing the production of leukotrienes