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]: john mercer langston (december 14, 1829 november 15, 1897) was a dean at howard university.
[EX A]: john mercer langston

[EX Q]: fukuoka airport (, fukuoka kuko) , formerly known as itazuke air base, is a japanese airport in fukuoka.
[EX A]: fukuoka airport

[EX Q]: christina applegate (born november 25, 1971) is an american actress.
[EX A]:
christina applegate