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': 'Vitamin C is the co-enzyme for the following hydroxylases EXCEPT \nSelect and explain. \nA. Peptidyl glycine hydroxylase, B. Dopamine betahydroxylase, C. Prolyl/ lysyl hydroxylase, D. Aspartate betahydroxylase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: -Vitamin C plays the role of a coenzyme in hydroxylation of proline and lysine while protocollagen is converted to collagen\xa0 (i.e.\xa0 post-translational modification). The hydroxylation reaction is catalysed by lysyl hydroxylase\xa0 (for\xa0 lysine)\xa0 and prolyl\xa0 hydroxylase (for\xa0 proline).\n-Hydroxylation of\xa0 glycine\xa0 is\xa0 carried\xa0 out\xa0 by peptidylglycine\xa0 hydroxylase which\xa0 requires vitamin C.\n-Ascorbic acid\xa0 is required\xa0 for\xa0 the\xa0 oxidation\xa0 of\xa0 p-hydroxy\xa0phenylpyruvate (enzyme hydroxylase) to homogentisic acid in tyrosine metabolism.', 'role': 'assistant'}]