Which of the following is an example of a polysaccharide?

Polysaccharides are complex carbohydrates that are made up of long chains of sugar units, specifically glucose molecules. Glycogen is a prime example of a polysaccharide as it serves as an energy storage form in animals. It consists of numerous glucose molecules linked together, allowing for quick mobilization of energy when needed.

In the context of other choices, amino acids represent the building blocks of proteins and do not fall into the category of carbohydrates. Triglycerides are composed of glycerol and fatty acids, serving as a form of fat storage but are not carbohydrates. Fatty acids themselves are components of lipids. Thus, glycogen is unique among the choices as it relates directly to carbohydrate storage and energy use in living organisms.