This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
[{'content': 'Warfarin acts by inhibiting the activation of all the following factors except:- \nSelect and explain. \nA. Factor III, B. Factor VII, C. Factor IX, D. Factor X', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Warfarin acts by inhibiting the activation of vitamin K dependent clotting factors- directly inhibiting Vit K epoxide reductase These factors include clotting factors II, VII, IX and X.', 'role': 'assistant'}]