Which of the following is not a monosaccharide?

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Monosaccharides are the simplest carbohydrates, consisting of a single sugar unit. Sucrose, on the other hand, is made up of two monosaccharides—glucose and fructose—linked together by a glycosidic bond. Because it contains two sugar units, it is a disaccharide, not a monosaccharide. The other listed sugars are single units: glucose and galactose are aldose monosaccharides, while fructose is a ketohexose monosaccharide.