This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Vit k helps in gamma-carboxylation of following AA 
Select and explain. 
A. Glutamate, B. Aspaate, C. Glycine, D. Alanine
A: Glutamate
Answer: A: Glutamate 
Explanation: Vitamin k plays a role in gama carboxylation of glutamate containing proteins It is a posttransilational modification Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 20,21,22