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: Pharmacology
[{'content': 'The biochemical role of vitamin K in the post translational modification of clotting factors is by : \nSelect and explain. \nA. Glycosylation, B. Carboxylation, C. Acetylation, D. Phosphorylation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]