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 boeing international headquarters (colloquially known as the boeing building and formerly known as the morton international building) is a 36-floor skyscraper located in the near west side of chicago.
[EX A]: boeing international headquarters

[EX Q]: spintronics is a kind of electronics that uses the tiny magnetic fields that come from electrons as well as their electric charge.
[EX A]: spintronics

[EX Q]: chen zhongshi (; august 1942 – 29 april 2016) was a chinese author.
[EX A]:
chen zhongshi