This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification and metabolism of amino acids, Subject name: Biochemistry
[{'content': 'Which of the following amino acid can produce oxaloacetate directly in a single reaction? \nSelect and explain. \nA. Alanine, B. Cysteine, C. Threonine, D. Aspaate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Alanine, Cysteine and Threonine can also produce oxaloacetate but pyruvate only. Aspaate can directly produce oxaloacetate in a single step, i.e. transamination reaction.', 'role': 'assistant'}]