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It's an organic chemistry question, but imagine acetone (a regular ketone). Now just add an OH at the end of each of the two free carbons (not the carbonyl carbon). The question asks to classify it on four criteria: ketone, alcohol, carbohydrate, and acetal. It's definitely a ketone and alcohol, but in the passage it explicitly says it's an intermediate in carbohydrate metabolism. I was thinking for sure that the answer explanation would say that an intermediate can't be considered a carbohydrate, but all the answer explanation says is that "it's a carbohydrate", but I don't see how you can say that when you say it's an intermediate in the catabolization of carbs..