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.

Ex Input:
the canton of bellerive-sur-allier is an administrative division of the allier department in central france.

Ex Output:
canton of bellerive-sur-allier


Ex Input:
in organic chemistry, an epoxide is a molecule that has a ring with at least three atoms in total, two carbon atoms and one oxygen atom.

Ex Output:
epoxide


Ex Input:
nick clegg was a member of the european parliament (mep) from 1999 to 2004 and was first elected as a liberal democrat mp in the 2005 general election.

Ex Output:

nick clegg