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.

[Q]: doriva (born 28 may 1972) is a former brazilian football player.
[A]: doriva


[Q]: boyz ii men is an american boy band from philadelphia, pennsylvania.
[A]: boyz ii men


[Q]: police academy: the series, also known as police academy: the animated series, is an popular 1988 american animated television series based on the "police academy" series of films.
[A]:
police academy: the animated series