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

[EX Q]: Where is David Cameron's Oxfordshire constituency?
[EX A]: david cameron

[EX Q]: What is the cathedral church of Rome?
[EX A]: cathedral

[EX Q]: The picture of which American President appears on the one dollar bill?
[EX A]:
president of the united states