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': 'Tricarboxylic acid cycle to be continuous requires the regeneration of \nSelect and explain. \nA. Pyruvic acid, B. oxaloacetic acid, C. α-oxoglutaric acid, D. Malic acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oxaloacetate may be viewed as a catalyst, which enters into the reaction, causes complete oxidation of acetyl CoA and comes out of it without any change.\nReference: Vasudevan 7th\xa0 ed, pg 249', 'role': 'assistant'}]