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
[{'content': 'Vitamin required for post-translational modification of clotting factors: \nSelect and explain. \nA. Vitamin A, B. Vitamin D, C. Vitamin E, D. Vitamin K', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]