Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

the occipital lobe is the back part of a mammal's brain.
occipital lobe

a hamburger is a type of sandwich with cooked ground meat between the two halves of a bun.
hamburger

the southern connecticut state university is one of four universities in the u.s. state of connecticut.

southern connecticut state university

