This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anticoagulants and Coagulants, Subject name: Pharmacology
Vitamin K is involved in the post-translational modification of? 
Select and explain. 
A. Glutamate, B. Aspartate, C. Glycine, D. GABA
A: Glutamate
Answer: A: Glutamate 
Explanation: Ans. (A) Glutamate(Ref Katzung 11/e p595)Vitamin K causes gamma carboxylation of glumate residues in many clotting factors that result in their activation.