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: Biochemistry
[{'content': 'The vitamin-K dependent proteins C and 5 are characterized by their ability to inactivate factor \nSelect and explain. \nA. VIIIa and Va, B. VIIIa, C. Va, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]