This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acid Metabolism, Subject name: Biochemistry
[{'content': 'Oxaloacetate is formed from? \nSelect and explain. \nA. Proline, B. Glutamate, C. Aspartate, D. Lysine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Aspartate', 'role': 'assistant'}]