The monosaccharide from the list you provided is fructose.
To clarify:
- Lactose is a disaccharide composed of glucose and galactose.
- Cellulose is a polysaccharide made up of glucose units.
- Sucrose is a disaccharide composed of glucose and fructose.
Fructose, on the other hand, is a simple sugar (monosaccharide) found in many plants.