Answer: A. Glucose
Explanation: Monosaccharides, or simply sugar, is the simplest type of sugar, which cannot be further processed, i.e. hydrolysed to produce even simpler sugar. Monosaccharides are basic units of carbohydrates, have a solid crystalline structure and are easily soluble in water. Some of the monosaccharides are glucose, fructose, galactose. They are also the building blocks of some of the more complex structures of disaccharides and polysaccharides, such as lactose, sucrose. cellulose.