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

[EX Q]: The site of the 1461 Battle of Mortimer's Cross lies in which English county?
[EX A]: battle of mortimer's cross

[EX Q]: Which future Nobel Prize winner did Bill Clinton choose as his Vice President?
[EX A]: vice president of the united states

[EX Q]: What is the chemical symbol for copper?
[EX A]:
copper