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': 'Urea synthesis is mediated by \nSelect and explain. \nA. Ornithine decarboxylase, B. Aspartate transaminase, C. Arginase, D. Citrulline synthase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Arginase catalyses the formation of urea from arginine.', 'role': 'assistant'}]