What is the hydrolysis product of $Lactose$?

Glucose forms many derivatives. The derivative which will help to prove the furanose structure is

Name the macromolecules that are chosen as drug targets.

$D$-Mannose $\overset{HO^{-}}{\longleftrightarrow}$ $D$-Glucose $\overset{HO^{-}}{\longleftrightarrow}$ $(A)$.
Product $(A)$ of the above reaction is:

Ribose is an example of .........

What is the molecular formula of glyceraldehyde?