What type of sugar is galactose?

Galactose is classified as a sugar found primarily in milk and dairy products. It is a monosaccharide that serves as one of the building blocks of lactose, which is the sugar present in milk. When lactose is digested, it is broken down into its two constituent sugars: glucose and galactose. This connection to milk is significant because it highlights the role of galactose in human nutrition, particularly in infant development where breast milk is a primary source of lactose.

In contrast, while other types of sugars might be found in different sources such as fruits or starches, galactose's primary association is with milk. The other options do not accurately reflect the primary context in which galactose is found, reinforcing why identifying it as a sugar in milk is the most accurate answer.