If these are the choices:
A. No other biomolecules are present
B. Protein
C. Lipid
D. Carbohydrate
My answer is D. Carbohydrate.
A nucleotide has three parts. These parts are 1) nucleobase aka nitrogenous base, 2) a five-carbon sugar or pentose sugar (either ribose or 2-deoxyribose), and 3) one or more phosphate groups.
D. Carbohydrate is under the 2) pentose sugar part of the nucleotide.
