<prompt> Mechanism of action of zileuton:Inhibit prostaglandin synthesisInhibit COXInhibit LOXInhibit mast cells  <response>: Ans. C. Inhibit LOXArachidonic acid is acted upon by two enzyme-COX and LOX. Lox converts it into leukotrienes and Cox into prostaglandin. Zileuton is the inhibitor of LOX enzyme and it is used in treatment of asthma. 