This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Which is the product excreted unchanged in catabolism of pyrimidine? \nSelect and explain. \nA. Uric acid, B. NH3, C. Pseudouridine, D. Beta alanine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pseudouridine is excreted unchanged as it cannot be catabolized in human.', 'role': 'assistant'}]