This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gluconeogenesis, Subject name: Biochemistry
[{'content': 'Pyruvate is converted to which substance to start gluconeogenesis? \nSelect and explain. \nA. Oxaloacetate, B. Phosphenol pyruvate, C. Cis-aconitate, D. Succinate', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) OxaloacetateRef Harper's Biochemistry 28/e, chapter 20", 'role': 'assistant'}]