Read the following with respect to digestion of carbohydrates.

A)  $\text{Starch}\stackrel{\text{Amylase}}{\to }\text{ Disaccharides}$

B)  $\text{Maltose}\stackrel{\text{Maltase}}{\to }\text{ Glucose + Glucose}$

C) $\text{Sucrose}\stackrel{\text{sucrase}}{\to }\text{Fructose}+\text{Glucose}$

D) $\text{Lactose}\stackrel{\text{Lactase}}{\to }\text{ Galactose + Glucose}$

Identify the reaction(s) that occur(s) in alkaline medium only.