Answer : 3. "Lactose"
Explanation :

Answer: C) Lactose Explanation: Lactose is the major carbohydrate in the milk of most species.   Lactose is a disaccharide composed of the monosaccharides D-glucose and D-galactose, joined in a ß-1,4-glycosidic linkage. The chemical name for lactose is 4-0-ß-D-galactopyranosyl-D-glucopyranose.