This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Vitamin K is involved in the action of the following proteins except \nSelect and explain. \nA. Factor II, B. Factor X, C. Factor I, D. Protein C', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vitamin K dependent factors are Factors II, VII, IX, X, Protein C and S Ref: Ganong 25th ed/page 566', 'role': 'assistant'}]