instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which Beatle played Youngman Grand in The Magic Christian 1969, with Peter Sellers?
answer:
the beatles


question:
Which is the only Avril Lavigne song to have reached No.1 in the US Billboard Chart?
answer:
avril lavigne


question:
The Battle of Bomarsund of 1854 was a battle that took place during which war?
answer:

battle of bomarsund