instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Who plays Isobel Crawley in the UK television series 'Downton Abbey'?
answer:
downton abbey


question:
Written by Edgar Allen Poe and published in 1845, what poem repeats the famous line `nevermore`?
answer:
edgar allan poe


question:
Which is the main city in the New Zealand region of Canterbury?
answer:

canterbury