Question

a monosaccharide is a *
protein
nucleic acid
lipid
carbohydrate

Explanation:

Monosaccharides are the simplest form of carbohydrates. They are single - sugar molecules. Proteins are made up of amino acids. Nucleic acids (like DNA and RNA) are made of nucleotides. Lipids are a diverse group including fats, phospholipids, etc. Since the question is about what a monosaccharide is classified as, based on the definitions of these biological macromolecules.

Answer:

carbohydrate