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.

Q: a releaser is a stimulus from one animal to another, which causes a particular response.

A: releaser
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Q: allan holdsworth (6 august 1946 15 april 2017) was a british guitarist and composer.

A: allan holdsworth
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Q: walt disney studios home entertainment (also called buena vista home entertainment) is the division of the walt disney company that distributes videos of movies to be played in the home.

A:
walt disney studios home entertainment
****