This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Vitamin K carboxylates 
Select and explain. 
A. Aspaate, B. Glutamate, C. Tyrosine, D. Tryptophan
B: Glutamate
Answer: B: Glutamate 
Explanation: The vitamin K-dependent (VKD)3carboxylase is a bifunctional enzyme that catalyzes the oxygenation of vitamin Khydroquinone, resulting in formation of vitamin K epoxide, in parallel with the carboxylation of multipleglutamate (Glu) residues in vitamin K-dependent proteins Ref ganong's review of medical physiology 25e