Which Molecule is a Disaccharide

Question

Which molecule is a disaccharide?
A) Glucose
B) Lactose
C) Water
D) Fructose

Accepted Answer

A disaccharide is a sugar composed of two monosaccharides, and lactose is a disaccharide composed of glucose and galactose. Glucose, fructose, and water are all single molecules and therefore not disaccharides.