This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Biochemistry
[{'content': 'Which is a product of purine metabolism? \nSelect and explain. \nA. Uric acid, B. Urea, C. Xanthine, D. Beta alanine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Uric acid is the common end product of purine catabolism. However, in non-primate mammals, Allantoin is the end product of purine catabolism as an extra enzyme, Uricase is present. OTHER OPTIONS: OPTION B: The end products of pyrimidine catabolism are NH3, CO2 & beta alanine (for Cytosine, Uracil) Option C - Xanthine is an intermediate of catabolism of purines. Xanthine gets conveed to uric acid by Xanthine Oxidase.', 'role': 'assistant'}]