Where is galactose primarily found?

Galactose is primarily found in milk and dairy products, making it the correct answer. It is one of the two monosaccharides that form lactose, the sugar present in milk. When lactose is digested, it is broken down into glucose and galactose. This sugar is not commonly found in significant amounts in fruits, vegetables, or grains, as those primarily contain other types of sugars such as fructose and glucose. Therefore, the presence of galactose in higher quantities is specifically associated with dairy products, reinforcing that option as the accurate choice.