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]: defibrillation is the act of defibrillating the heart to treat the heart when it is not pushing blood because the heart muscle is not working in any pattern.
[EX A]: defibrillation

[EX Q]: a web hosting service is a type of internet hosting service.
[EX A]: web hosting service

[EX Q]: robert william gary moore (4 april 1952 – 6 february 2011) or gary moore, was a musician from belfast, northern ireland.
[EX A]:
gary moore