Which of the following statements is incorrect about $\alpha-D$-glucopyranose and $\beta-D$-glucopyranose?

An example of a non-reducing sugar is:

Glucose is a

Given below are two statements: one is labelled as Assertion $A$ and other is labelled as Reason $R.$
Assertion $A :$ Sucrose is a disaccharide and a non-reducing sugar.
Reason $R :$ Sucrose involves glycosidic linkage between $C_{1}$ of $\beta$-glucose and $C_{2}$ of $\alpha$-fructose.
Choose the most appropriate answer from the options given below :

Which one acts as a non-reducing sugar?

Consider the following:
Statement-$I$ : Lactose is composed of $\alpha-D$-glucose and $\beta-D$-galactose.
Statement-$II$ : Lactose is a reducing sugar.
The correct answer is