This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TCA Cycle, Subject name: Biochemistry
[{'content': 'TCA cycle depends on availability of : \nSelect and explain. \nA. Acetyl CoA, B. Oxaloacetate, C. Insulin, D. Glucagon', 'role': 'user'}, {'content': "Answer: B \nExplanation: TCA cycle depends on availability of Oxaloacetate TCA cycle : Has no hormonal control. Vital cycle for the cells. Doesn't depend on insulin or glucagon. Depends on the availability of oxaloacetate. (not Acetyl CoA).", 'role': 'assistant'}]