This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anticoagulants and Coagulants, Subject name: Pharmacology
[{'content': 'Vitamin K is involved in the post-translational modification of? \nSelect and explain. \nA. Glutamate, B. Aspartate, C. Glycine, D. GABA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Glutamate(Ref Katzung 11/e p595)Vitamin K causes gamma carboxylation of glumate residues in many clotting factors that result in their activation.', 'role': 'assistant'}]