instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
And Then There Were None?
answer:
and then there were none


question:
What was the last silent film in which Chaplin's little tramp appeared?
answer:
chaplin


question:
The naval battle fought on 2 April 1801 known as the Battle of Copenhagen was fought between Denmark and a navy from where?
answer:

battle of copenhagen