This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Warfarin acts by 
Select and explain. 
A. Inhibition of Vitamin K epoxide reductase, B. Inhibition of gamma glutamyl carboxylase, C. Activation of Vitamin K epoxide reductase, D. Activation of gamma glutamyl carboxylase
A: Inhibition of Vitamin K epoxide reductase
Answer: A: Inhibition of Vitamin K epoxide reductase 
Explanation: Ans. is 'a' i.e., Inhibition of Vitamin K epoxide reductase