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
[{'content': 'A 34 years old man with a long history of asthma is referred to a pulmonologist. The physician decides to prescribe zileuton. The mechanism of action of this drug is to : \nSelect and explain. \nA. Antagonize leukotriene D4 receptor, B. Inhibits 5–lipoxygenase, C. Inhibit phosphodiesterases, D. Stimulate β2 receptors', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]