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
[{'content': 'Which amino acid residues gets carboxylated by vitamin K during post translational modification \nSelect and explain. \nA. Aspartate, B. Glutamate, C. Oxaloacetate, D. Lysine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Vitamin K is required for the post translational gamma carboxylation of glutamic acid residues of clotting factors.', 'role': 'assistant'}]