After about 10 days of fasting,which one of these compounds will be the nervous system's main fuel provider?

Question

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After about 10 days of fasting, the body will have used up its glycogen stores (from carbohydrates) and will shift to ketosis. In ketosis, the liver produces ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone) from fatty acids, which can fuel the brain and nervous system. Therefore, ketone bodies are the nervous system's main fuel provider during prolonged fasting.

After About 10 Days of Fasting,which One of These Compounds