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 K is involved in post translation modification of which of the following aminoacids? 
Select and explain. 
A. Glutamate, B. Aspaate, C. Lysine, D. Proline
A: Glutamate
Answer: A: Glutamate 
Explanation: Vitamin K is a cofactor required for the gamma carboxylation of glutamic acid. Ref: Textbook of Biochemistry by D.M Vasudevan3rd edn/page 267