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': 'Mitochondria are involved in all except \nSelect and explain. \nA. Fatty acid synthesis, B. DNA synthesis, C. Citric acid cycle, D. Fatty acid β-oxidation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fatty acid synthesis occurs in the cytosol.\nCitric acid cycle and (β-oxidation of fatty acids takes place in mitochondria.\nMitochondria are the only organelle, beside nucleus, which can synthesize DNA.', 'role': 'assistant'}]