Identify the one which does not belong to the class to which the other three belong based on hydrolysis 
 

$$\begin{gathered} \mathrm{Sucrose} \stackrel{{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{\to } \mathrm{Glucose} +\hspace{0.17em}\mathrm{Fructose} \\ \mathrm{Lactose} \stackrel{{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{\to } \mathrm{Glucose} +\hspace{0.17em}\hspace{0.17em}\mathrm{Galactose} \\ \mathrm{Maltose} \stackrel{{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{\to } \mathrm{Glucose} \hspace{0.17em}\hspace{0.17em}+\hspace{0.17em}\mathrm{glucose} \end{gathered}$$

Fructose is a monosaccharide which can not be further hydrolysed.