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': 'In which of the following step of TCA cycle, carbon dioxide is removed? \nSelect and explain. \nA. Alpha-ketoglutarate dehydrogenase, B. Malate dehydrogenase, C. Succinate dehydrogenase, D. Fumarase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a)Alpha-ketoglutarate dehydrogenase The two oxidative decarboxylation reactions of the TCA cycle are: 1. Isocitrate dehydrogenase 2. a-ketoglutarate dehydrogenase', 'role': 'assistant'}]