Milk contains which of the following disaccharides?

Which of the following substances is found in abundance in nature?

What is the monomer of cellulose?

$D$-Glucose and $L$-Glucose are

Aldopentoses named as ribose and $2-$deoxyribose are found in nucleic acids. What is their relative configuration?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Ketoses give Seliwanoff's test faster than Aldoses.
Reason $(R)$: Ketoses undergo $\beta$-elimination followed by formation of furfural.
In the light of the above statements,choose the correct answer from the options given below: