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': 'Vitamin K is ivolved in the posttranslational modification? \nSelect and explain. \nA. Glutamate, B. Aspartate, C. Leucine, D. Lysine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]