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': 'In vitamin C deficiency, post-translational modification of which amino acid is defective \nSelect and explain. \nA. Lysine, B. Alanine, C. Glycine, D. Arginine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamin C is required for post-translational hydroxylation of proline and lysine residue.', 'role': 'assistant'}]