This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'All are components of Citric acid cycle EXCEPT: \nSelect and explain. \nA. Fumarase, B. Malonate, C. Succinate dehydrogenase, D. Alpha-ketoglutarate dehydrogenase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Malonate competitively inhibits succinate dehydrogenase, which conves succinate to fumarate', 'role': 'assistant'}]