This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
[{'content': 'NAD+ reduced by all of the following enzymes except: \nSelect and explain. \nA. Alpha ketoglutarate dehydrogenase, B. Iso-citrate dehydrogenase, C. Malate dehydrogenase, D. Succinyl dehydrogenase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. Succinyl dehydrogenaseNiacin acts as electron acceptor for the following enzymes:Isocitrate dehydrogenaseAlpha ketoglutarateMalate dehydrogenase', 'role': 'assistant'}]