Final answer:
Glycogen is the example of a polysaccharide among the options given, which includes glucose chains linked into a large, branched polymer and serves as the primary energy storage in animals.
Step-by-step explanation:
An example of a polysaccharide from the options given is glycogen. Polysaccharides are complex carbohydrates composed of long chains of monosaccharide units linked together. Glycogen is primarily found in animals and is a highly branched molecule made up of glucose units. This molecule serves as the main storage form of energy in the human body, particularly in the liver and muscle cells. Alternatives such as fructose, deoxyribose, sucrose, and glucose are either monosaccharides or disaccharides, and hence, do not qualify as polysaccharides. Glycogen's structure involves α-D-glucose units linked by α-1→ 4 linkages in linear chains and α-1→ 6 linkages at the branches, indicating its complex nature as compared to simple sugars.