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
[{'content': 'Warfarin acts by \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Inhibition of Vitamin K epoxide reductase", 'role': 'assistant'}]