Name the simplest "aldose" and "ketone"

Aldose is monosaccharide sugar in which the carbon backbone chain has carbonyl group on endmost carbon atom which corresponds to an aldehyde, and the hydroxyl groups are connected to all other carbon atoms.

Example - Glucose

Ketone is functional group with structure RC (=O) R', where the groups, R and R' can be variety of the carbon-containing substituents.

Example, Ethylmethylketone