This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
During starvation, Brian utilizes 
Select and explain. 
A. Glycogen, B. Fattey acids, C. Ketone bodies, D. None
C: Ketone bodies
Answer: C: Ketone bodies 
Explanation: Brain and starvation: During starvation, a significant pa (60-70%) of the energy requirement of the brain is then met by ketone bodies (Fig. 8.1) Brain and acetoacetate: The brain is unable to utilize fatty acids as a source of fuel since the fatty acids complexed to albumin are unable to traverse the blood-brain barrier. But, the brain can effectively utilize acetoacetate. This is again a survival technique in diabetic and starvation ketosis.Ref: DM Vasudevan, 7th edition, page no: 100