This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Vitamin k associated clotting factors are 
Select and explain. 
A. 9,10, B. 1,5, C. 7,8, D. 1,81
A: 9,10
Answer: A: 9,10 
Explanation: Ref Robbins 8/e 118-119 ; 9/e p 119 Physiologic Effects of Vitamin K Vitamin K serves as an essential cofactor for a carboxylase that catalyzes carboxylation of glutamic acid residues on vitamin K-dependent proteins. The key vitamin K-dependent proteins include: Coagulationproteins: factors II (prothrombin), VII, IX and X.