This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lipids, Subject name: Biochemistry
[{'content': 'The major fuel in the brain after several weeks of starvation is: \nSelect and explain. \nA. Glucose, B. Fatty acid, C. b-Hydroxybutyrate, D. Glycerol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. b-Hydroxybutyrate(Ref: Harper 31/e page 210)In the prolonged fasting stage, 20% of brains energy is met by ketone bodies. Rest by available glucose. But after several weeks of starvation, ketone bodies provide the major metabolic fuel.', 'role': 'assistant'}]