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

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

[EX Q]: What is the alcoholic ingredient of a Screwdriver cocktail?
[EX A]: screwdriver

[EX Q]: In the 2012 Olympics, who won the gold medal in the Men's Singles at tennis?
[EX A]:
2012 summer olympics