Lactose on hydrolysis gives

β-D-Galactose and β-D-Glucose

The correct answer is Option (1) → β-D-Galactose and β-D-Glucose

• Lactose is a disaccharide commonly known as milk sugar. When it undergoes hydrolysis (breaking down with water, often catalyzed by the enzyme lactase), it splits into its two constituent monosaccharides. Lactose is a disaccharide made of β-D-galactose and β-D-glucose.
• They are linked by a β-1,4-glycosidic bond.
• On hydrolysis, lactose breaks to give these two monosaccharides.