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': 'Enzyme responsible for complete oxidation of glucose to CO2 and water is present in: \nSelect and explain. \nA. Cytosol, B. Mitochondria, C. Lysosomes, D. ER', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Under aerobic conditions, pyruvate is taken up into mitochondria, and after oxidative decarboxylation to\xa0acetyl-CoA is oxidized to CO2 by the citric acid cycle.\nUnder anaerobic conditions, pyruvate is reduced\xa0by\xa0the\xa0NADH\xa0to\xa0lactate,\xa0catalyzed\xa0by lactate\xa0dehydrogenase.\n\n(Ref: Harper Ed. 29th\xa0pg173, Ed 30th pg 172)', 'role': 'assistant'}]