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
In which of the following step of TCA cycle, carbon dioxide is removed? 
Select and explain. 
A. Alpha-ketoglutarate dehydrogenase, B. Malate dehydrogenase, C. Succinate dehydrogenase, D. Fumarase
A: Alpha-ketoglutarate dehydrogenase
Answer: A: Alpha-ketoglutarate dehydrogenase 
Explanation: Ans: a)Alpha-ketoglutarate dehydrogenase The two oxidative decarboxylation reactions of the TCA cycle are: 1. Isocitrate dehydrogenase 2. a-ketoglutarate dehydrogenase