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

[Q]: What breed of dog is Marmaduke in the newspaper cartoon strip of that name?
[A]: dog

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

[Q]: The children's toy Silly Putty was taken on board by the crew of which Apollo mission?
[A]:
apollo program