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
In humans, end product of purine metabolism 
Select and explain. 
A. Allantoin, B. Uric acid, C. CO2, D. None
B: Uric acid
Answer: B: Uric acid 
Explanation: Question repeated