TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: In which bay is Alcatraz?

SOLUTION: alcatraz island

PROBLEM: Ewart was the middle name of which British Prime Minister?

SOLUTION: prime minister of the united kingdom

PROBLEM: Apart from George, who was the only other Beatle to appear at the 1971 Concert for Bangladesh at Madison Square?

SOLUTION:
the beatles