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
Which is a product of purine metabolism? 
Select and explain. 
A. Uric acid, B. Urea, C. Xanthine, D. Beta alanine
A: Uric acid
Answer: A: Uric acid 
Explanation: 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.