This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, Subject name: Pharmacology
[{'content': 'Zileuton is a \nSelect and explain. \nA. 5 lipooxygenase inhibitor, B. TXA2 inhibitor, C. Leukoteriene receptor antagonist, D. Prostaglandin synthesis inhibitor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Zileuton is an orally active inhibitor of 5-lipoxygenase, and thus inhibits leukotrienes (LTB4, LTC4, LTD4, and LTE4) formation, used for the maintenance treatment of asthma. Ref: KD Tripathi 8th ed', 'role': 'assistant'}]