This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
[{'content': 'Isocitrate dehydrogenase is linked to \nSelect and explain. \nA. NAD, B. FAD, C. NADP, D. FMN', 'role': 'user'}, {'content': 'Answer: A \nExplanation: There are three isoenzymes of isocitrate dehydrogenase. One, which uses NAD+, is found only in mitochondria. The other two use NADP+ and are found in mitochondria and the cytosol. Respiratory-chain-linked oxidation of isocitrate occurs through the NAD+-dependent enzyme. Reference: Harper; 30th edition; Page no: 163', 'role': 'assistant'}]