<prompt> Warfarin acts by -Inhibition of Vitamin K epoxide reductaseInhibition of gamma glutamyl carboxylaseActivation of Vitamin K epoxide reductaseActivation of gamma glutamyl carboxylase  <response>: Ans. is a i.e., Inhibition of Vitamin K epoxide reductase o During g-carboxylation of the coagulant factor II, VII, IX and X in the liver, active vitamin K Vit K hydroquinone is oxidized to an epoxide vit K epoxide.o Vit K epoxide must be reduced to vit K hydroquinone to become active once again vit K cycle,o Vit K epoxide is reduced to vit K hydroquinone by vit K reductase.o This vit K reductase is inhibited by oral anticoagulants. 