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
Which is not involved in local hemostasis 
Select and explain. 
A. Fibrinogen, B. Calcium, C. Vit k, D. Collagen
C: Vit k
Answer: C: Vit k 
Explanation: Ref Robbins 9/e p118-119 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