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.

walter rudolf hess (17 march 1881 – 12 august 1973) was a swiss physiologist.
walter rudolf hess

the corruption perceptions index is an index that shows how corrupt certain countries are.
corruption perceptions index

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

southern connecticut state university