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

[EX Q]: Which English king was married to Eleanor of Castile?
[EX A]: eleanor of castile

[EX Q]: Which English king was the son of Edward, the Black Prince?
[EX A]: edward, the black prince

[EX Q]: Who has been appointed as successor to Mervyn King as Governor of the Bank of England?
[EX A]:
bank of england