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 australian classification board is a government agency in australia that controls censorship and classifications.
[EX A]: australian classification board

[EX Q]: the 7 july 2005 london bombings (also called 7/7) were suicide bomb attacks aimed at london's public transport system during the morning rush hour.
[EX A]: 7 july 2005 london bombings

[EX Q]: gurkhas (gorkhas) are nepali citizens recruited into the british army, and now also recruited into the modern nepali and indian armies.
[EX A]:
gurkha