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 k is required for post translational modification of \nSelect and explain. \nA. oxidation, B. carboxylation, C. methylation, D. Hydroxylation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The role of vitamin K is in the post-translational modification i.e, gcarboxylation of glutamic acid residues in proteins such as : Coagulation factors : Factor II, VII, IX, X Protein C and S Osteocalcin Nephrocalcin Reference: Harpers illustrated biochemistry 30th edition', 'role': 'assistant'}]