instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Against which country did Britain fight 'The Cod Wars'?
answer:
cod wars

question:
Chris Martin is the lead singer with which band who had several hits in the 2000s?
answer:
chris martin

question:
Who wrote Around the World in Eighty Days and Twenty Thousand Leagues Under the Sea?
answer:
around the world in eighty days