Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[Q]: Who wrote and recorded the original version of the song Blue Suede Shoes which was a hit single for Elvis Presley in 1955?
[A]: blue suede shoes


[Q]: With eight goals which Barcelona player was the leading scorer in the 2009-10 Champions League?
[A]: barcelona


[Q]: Which actress played Arwen in the trilogy of films?
[A]:
arwen