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': 'Nitrogen atoms in Urea are derived from \nSelect and explain. \nA. Aspartate, B. Ammonia, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]