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 features of a production vehicle or production car are mass-produced identical models, offered for sale to the public.

Ex Output:
production vehicle


Ex Input:
the division of moore is an australian electoral division in the state of western australia.

Ex Output:
division of moore


Ex Input:
kimora lee simmons (born may 4, 1975) is an american fashion model.

Ex Output:

kimora lee simmons