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]: natassia gail zolot (born september 24, 1989 in san francisco, california), known by her stage name, kreayshawn, is an american rapper, editor and music video director.
[EX A]: kreayshawn

[EX Q]: a viola is a musical instrument which is similar to the violin and cello.
[EX A]: viola

[EX Q]: batticaloa district ( ""; ) is one of the 25 districts of sri lanka.
[EX A]:
batticaloa district