This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'End product of purine metabolism in non-primate mammals is \nSelect and explain. \nA. Uric acid, B. Ammonia, C. Urea, D. Allantoin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Allantoin is a major metabolic intermediate in most organisms including animals, plants, and bacteria and is produced as a degradation product of purine nucleobases by urate oxidase (or uricase) from uric acid', 'role': 'assistant'}]