This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Vitamin used for post translational modification of glutamic acid to gamma carboxy glutamate is \nSelect and explain. \nA. A, B. D, C. E, D. K', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref Robbins 9/e p442 ,119. The vitamin K-dependent carboxylase carries out the posttranslational modification of specific glutamate residues in proteins togamma-carboxy glutamic acid (Gla) in the presence of reduced vitamin K, molecular oxygen, and carbon dioxide.', 'role': 'assistant'}]