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]: anthony quinn (april 21, 1915 june 3, 2001) was a mexican-american actor, as well as a painter and writer.
[EX A]: anthony quinn

[EX Q]: landing craft are small or medium sized boats.
[EX A]: landing craft

[EX Q]: green card or permanent resident card is an identification card that proves that someone who is not a united states citizen is a permanent resident of the united states.
[EX A]:
green card