Which of the following is an example of a monosaccharide?

Galactose is indeed an example of a monosaccharide because it is a simple sugar that consists of a single sugar unit with the chemical formula C6H12O6. Monosaccharides are the most basic form of carbohydrates and cannot be hydrolyzed into simpler sugars. Galactose is one of the building blocks of lactose, the sugar found in milk.

In contrast, sucrose and maltose are disaccharides formed from the combination of two monosaccharide units—sucrose consists of glucose and fructose, while maltose is made from two glucose molecules. Dextrin is a type of polysaccharide, which is a larger carbohydrate made up of multiple sugar units. Thus, galactose stands out as the only option that fits the definition of a monosaccharide, highlighting its role as a single-unit carbohydrate in the larger context of carbohydrate classification.