This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Pharmacology
Zileuton is:- 
Select and explain. 
A. 5- Lipoxygenase inhibitor, B. Cyclooxygenase, C. Phospholipase inhibitor, D. Leukotriene receptor antagonist
A: 5- Lipoxygenase inhibitor
Answer: A: 5- Lipoxygenase inhibitor 
Explanation: ZILEUTON inhibits LOX B: Cyclo oxygenase inhibitor: NSAID STEROIDS inhibit phospholipase D: Leukotriene Inhibitors MONTELEUKAST ZAFIRLEUKAST