This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bio-Chemistry), Subject name: Biochemistry
[{'content': 'The fuel used by neurons during starvation is - \nSelect and explain. \nA. Glucose, B. Fatty acid, C. Aminoacid, D. Ketone', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Ketone* There is no stored fuel in brain, but it utilizes 60% of total energy under resting conditions.* Glucose is virtually the sole fuel for the brain, except in prolonged starving when ketone bodies are the major source.* Fatty acids do not serve as fuel for the brain, because they are bound to albumin in plasma; hence cannot cross blood-brain barrier.", 'role': 'assistant'}]