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]: "if i never see your face again" is the fourth single by maroon 5.
[EX A]: if i never see your face again

[EX Q]: university college cork, or ucc for short, is one of the most famous universities in ireland, alongside trinity college dublin.
[EX A]: university college cork

[EX Q]: atmospheric chemistry is a branch of science in which the chemistry of the earth's atmosphere and that of other planets is studied.
[EX A]:
atmospheric chemistry