This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
[{'content': 'In TCA cycle, CO2 is released from \nSelect and explain. \nA. Thioinase, B. Isocitrate dehydrogenase, C. Citrate dehydrogenase, D. Alpha ketoglutrate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: During the citric acid cycle, two carbon dioxide molecules are removed in the following reactions: A. Step 3, isocitrate (oxalosuccinate) to alpha-ketoglutarate catalyzed by isocitrate dehydrogenase B. Step 4, alpha-ketoglutarate to succinyl CoA.it is from substrate co2is raised..not from enzymes. They are just catalyzing the reaction.Ref: MN Chatterjea Textbook of Medical Biochemistry, 8th Edition, Page no: 219', 'role': 'assistant'}]