Explanation

Macromolecules are large, complex molecules composed of smaller repeating units called monomers.

Thyroxin, haemoglobin, and insulin are all proteins, which are macromolecules made up of chains of amino acids.

Maltose, on the other hand, is a disaccharide, meaning it's made up of only two sugar units (glucose) and is not considered a true macromolecule.