Which of the following is a monosaccharide?

 # Which of the following is a monosaccharide? 

a. Galactose 

b. Lactose 

c. Maltose 

d. Sucrose 

The correct answer is A. Galactose.

Sucrose, lactose and maltose are disaccharides.

Sucrose = Glucose + Fructose

Lactose = Galactose + Glucose

Maltose = Glucose + Glucose