This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
[{'content': 'A 21-year-old woman with moderately severe asthma on three-drug treatment has elevated liver function tests thought to be caused by one of her medications. Which drug is causing this adverse effect? \nSelect and explain. \nA. Chromone agent, B. Lipoxygenase inhibitor, C. Leukotriene receptor antagonist, D. Methylxanthines', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Zileuton It is a 5-LOX inhibitor, blocks LTC4/D4 as well as LTB4 synthesis. It therefore has the potential to prevent all LT induced responses including those exeed by activation of cysLT1 receptor. Durationof action of zileuton is sho side effects:. HEPATOTOXIC Ref:- kd tripathi; pg num:-229', 'role': 'assistant'}]