Correct Answer: Glucose

Solution : The correct answer is Glucose.

The monomer unit of glycogen is glucose. Glycogen is a polysaccharide, which means it is composed of many glucose molecules linked together. It is the storage form of glucose in animals and humans, particularly in the liver and muscles. Glycogen serves as a readily accessible source of energy for the body when blood glucose levels are low, such as during periods of fasting or physical activity.