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': 'Carboxylation of clotting factors by vitamin K isrequired to be biologically active. Which of the following amino acid is carboxylated? \nSelect and explain. \nA. Histidine, B. Histamine, C. Glutamate, D. Aspaate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Glutamate [Ref: Harper 26/e p486/ See explanation of q no. 34 of Nov 2007.', 'role': 'assistant'}]