Concept: A polysaccharide is a complex carbohydrate made of many monosaccharide units linked together.Explanation:Starch is a polysaccharide composed of many glucose units joined by glycosidic bonds.Dextrose, mannose, and glucose are simple sugars, that is, monosaccharides.They are single sugar molecules, not long chains.Therefore, among the options, only starch is a polysaccharide.Answer: D. Starch