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
Mitochondria are involved in all except 
Select and explain. 
A. Fatty acid synthesis, B. DNA synthesis, C. Citric acid cycle, D. Fatty acid β-oxidation
A: Fatty acid synthesis
Answer: A: Fatty acid synthesis 
Explanation: Fatty acid synthesis occurs in the cytosol.
Citric acid cycle and (β-oxidation of fatty acids takes place in mitochondria.
Mitochondria are the only organelle, beside nucleus, which can synthesize DNA.