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
The vitamin-K dependent proteins C and 5 are characterized by their ability to inactivate factor 
Select and explain. 
A. VIIIa and Va, B. VIIIa, C. Va, D. None of the above
A: VIIIa and Va
Answer: A: VIIIa and Va 
Explanation: None