TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What is the cathedral church of Rome?

SOLUTION: cathedral

PROBLEM: In 1867 who became the first Prime Minister of Canada?

SOLUTION: prime minister of canada

PROBLEM: Who got to no.2 in the charts in 2002 with 'Cry Me a River'?

SOLUTION:
cry me a river