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': 'Both vitamin K and vitamin C are involved in \nSelect and explain. \nA. The synthesis of clotting factors, B. Post trasnslational modification, C. Antioxidant mechanisms, D. Microsomal hydroxylation reactions', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Both vitamin C and vitamin K are required for post translational modification\nVitamin C is required for post translational modification of proline & lysine in collagen synthesis.\nVit K is required for post translational modification of glutamate\xa0residue or generation of clotting factors.', 'role': 'assistant'}]