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
[{'content': 'Carbamoyl phosphate synthase I is used in \nSelect and explain. \nA. Purine synthesis, B. Pyrimidine synthesis, C. Urea cycle, D. Uronic acid pathway', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Carbamoyl phosphate synthase 1 conve CO2 + NH4 to Carvomyl phosphate Ref-Harpers illustrated biochemistry 30/e p680', 'role': 'assistant'}]