Disorders - Medical Science

Q1:

Which of the following sets belongs to a distinct class or category?

A Ribose, sucrose, glucose, fructose

B Sterols, waxes, fatty acids, amino acids.

C Oils, sterols, waxes, fats

D Nucleotide, nucleoside, nucleus, DNA

ANS:B - Sterols, waxes, fatty acids, amino acids.

How can option B is the correct answer?

To which class or category does it belongs to?