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 K is involved in post translation modification of which of the following aminoacids? \nSelect and explain. \nA. Glutamate, B. Aspaate, C. Lysine, D. Proline', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamin K is a cofactor required for the gamma carboxylation of glutamic acid. Ref: Textbook of Biochemistry by D.M Vasudevan3rd edn/page 267', 'role': 'assistant'}]