This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
All are vitamin K dependent clotting factors of hepatic origin except 
Select and explain. 
A. II, B. VII, C. VIII, D. X
C: VIII
Answer: C: VIII 
Explanation: Vitamin K has an impoant role in the blood clotting process. It brings about the posttranslational modification of ceain blood clotting factors clotting factor II (prothrombin), factor VII (SPCA) factor IX (Christmas factor) factor X (Stua prower factor) they are synthesized as inactive precursors (zymogens) in the liver ref DM Vasudevan 8th ed page 462