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 Q]: the wwe united states championship is a professional wrestling championship in world wrestling entertainment (wwe).
[EX A]: wwe united states championship

[EX Q]: the saint petersburg stadium (russian: Стадион Санкт-Петербург; also called the krestovsky stadium or zenit arena) is an association football stadium in saint petersburg, russia.
[EX A]: saint petersburg stadium

[EX Q]: momus is the god of blame in greek mythology.
[EX A]:
momus