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': 'Enzymes concerned with the citric acid cycle are found in the: \nSelect and explain. \nA. Nucleus, B. Ribosomes, C. Mitochondria, D. Nonparticulate cytoplasm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]