Glucose $\xrightarrow{HCN} A$ $\xrightarrow{Hydrolysis} B$ $\xrightarrow{HI, \Delta} C$. What is the final product $C$?

Glucose gives a silver mirror with Tollen's reagent. It shows the presence of:

Sugar can be tested in urine by

Given below are two statements.
Statement $I$: Maltose has two $\alpha$-$D$-glucose units linked at $C_1$ and $C_4$ and is a reducing sugar.
Statement $II$: Maltose has two monosaccharides: $\alpha$-$D$-glucose and $\beta$-$D$-glucose linked at $C_1$ and $C_6$ and it is a non-reducing sugar.
In the light of the above statements,choose the correct answer from the options given below.

Which of the following compounds is classified as an oligosaccharide?

Cellulose is a straight-chain polysaccharide composed of only