This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nucleotides, Subject name: Biochemistry
[{'content': 'Arrange the enzymes involved in purine catabolism in sequence: A. Uricase B. Xanthine Oxidase C. ADA D. Purine nucleoside phosphorylase \nSelect and explain. \nA. A -C-B- D, B. B -A-D- C, C. D -B-A- C, D. C -D-B- A', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]