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
If starvation exceeds 7 days, the major nutritional supply of the brain comes from 
Select and explain. 
A. Fatty acids, B. Ketone bodies, C. Protein breakdown, D. Carbohydrate breakdown
B: Ketone bodies
Answer: B: Ketone bodies 
Explanation: None