Upon hydrolysis, lactose yields:

Step-by-step solution

Lactose is a disaccharide commonly known as milk sugar. Upon acidic or enzymatic hydrolysis (using the enzyme lactase), lactose breaks down into its constituent monosaccharides. The two monosaccharide units present in lactose are D-glucose and D-galactose, which are joined by a -1,4-glycosidic linkage. Therefore, the hydrolysis of lactose yields glucose and galactose. Answer: glucose and galactose