Glycogen is a polysaccharide that functions as a storage form of energy (storage product) in animals . Globulins (specifically immunoglobulins) are proteins that function as antibodies involved in defense mechanisms . Steroids are a class of lipids that often function as hormones (e.g., testosterone, cortisol) . Thrombin is an enzyme (a protein), and enzymes act as biocatalysts in biochemical reactions . Therefore, the correct matching is A-(iv), B-(iii), C-(i), D-(ii).