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 ivolved in the posttranslational modification? 
Select and explain. 
A. Glutamate, B. Aspartate, C. Leucine, D. Lysine
A: Glutamate
Answer: A: Glutamate 
Explanation: None