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.

paranthropus is an extinct genus of robust australopithecines.
paranthropus

the arrondissement of auxerre is an arrondissement of france.
arrondissement of auxerre

mark cavendish (born 21 may 1985) is a manx racing cyclist who rides for team dimension data.

mark cavendish