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

[Q]: Eden Park staged some of the 2011 Rugby World Cup matches, in which city can it be found?
[A]: eden park


[Q]: With which song did Swedish pop group Abba win the 1974 Eurovision Song Contest?
[A]: abba


[Q]: Which fictitious riverboat gave Credence Clearwater Revival their first hit single in Britain?
[A]:
creedence clearwater revival