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
Vitamin required for post-translational modification of clotting factors: 
Select and explain. 
A. Vitamin A, B. Vitamin D, C. Vitamin E, D. Vitamin K
D: Vitamin K
Answer: D: Vitamin K 
Explanation: Vitamin KIt is a group of structurally similar, fat-soluble vitamins that the human body needs for post-translational modification of ceain proteins required for blood coagulation, and in metabolic pathways in bone and other tissue.They are 2-methyl-1,4-naphthoquinone (3-)derivatives.This group of vitamins includes two natural vitamers: vitamin K1 and vitamin K2.