Question

multiple choice question
antigens are usually a ______.
lipid
nucleic acid or protein
small polysaccharide or lipid
protein or large polysaccharide

Explanation:

Antigens are substances that can trigger an immune response. They are typically proteins or large polysaccharides due to their complex structures which can be recognized by the immune - system. Lipids, nucleic acids, small polysaccharides are less common as antigens compared to proteins and large polysaccharides.

Answer:

D. protein or large polysaccharide