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': 'Phenylbutyrate is used in the treatment of urea cycle disorders, because \nSelect and explain. \nA. It activates deficient enzymes, B. It maintains urine output, C. It acidifies the urine, D. It scavenges nitrogen.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Phenylbutyrate and sodium benzoate act as ammonia(nitrogen) scavengers.', 'role': 'assistant'}]