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]: central plaza is a skyscraper in hong kong.
[A]: central plaza


[Q]: dakota johnson (born october 4, 1989 in austin, texas) is an american actress and model.
[A]: dakota johnson


[Q]: bonn is a city near cologne.
[A]:
bonn