Option 1: Galactose is a monosaccharide that is typically found in dairy products. It is not stored in the liver as a form of sugar and it is not converted to glucose.

Option 2: Glycogen is the correct answer. It is the stored form of sugar in the liver as well as in muscles. When the body needs glucose, glycogen is broken down into glucose and released into the bloodstream.

Option 3: Maltose is a disaccharide that is produced by breaking down starch. It is not stored in the liver and it is not converted to glucose.

Option 4: Sucrose is a disaccharide commonly known as table sugar. It is not stored in the liver and it is not converted to glucose.

In summary, option 2 (Glycogen) is the correct answer because it is the form of sugar that is stored in the liver and converted to glucose when needed by the body.