This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of Purines and Pyrimidines, Subject name: Biochemistry
[{'content': 'Allantoin is the end product of metabolism of - \nSelect and explain. \nA. Glycogen, B. Purine, C. Pyrimidine, D. Histidine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' Le., Purine o In non-primate mammals, end product of purine metabolism is allantoin due to presence of enzyme uricase. Uricase convenes uric acid to allantoin.o Humans lack the enzyme uricase. Therefore, end product of purine catabolism in humans is uric acid.", 'role': 'assistant'}]