This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'The two nitrogen atoms that are incorporated into the urea cycle. The source of the nitrogen is \nSelect and explain. \nA. Glutamate & Aspaate, B. Aspaate & Arginine, C. Aspaate & NH3, D. Glutamate & NH3', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Two nitrogen atoms of urea are derived from two different sources, one from ammonia and the other directly from alpha amino group of aspaic acid.Ref: DM Vasudevan - Textbook of Biochemistry, 6th edition, page no: 203', 'role': 'assistant'}]