This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Fatty acids used by all except 
Select and explain. 
A. Liver, B. Muscle, C. Brain, D. Kidney
C: Brain
Answer: C: Brain 
Explanation: Ref-Harpers illustrated biochemistry 30/e p374 FattyFatty acids do not serve as fuel for the brain, because they are bound to albumin in plasma and so do not traverse the blood-brain barrier. In starvation, ketone bodies generated by the liver paly replace glucose as fuel for the brain. Muscle. The major fuels for muscle are glucose, fatty acids, and ketone bodies.