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

[Q]: Devil's Tower National Monument in Wyoming, USA features prominently in which landmark 1977 science fiction film?
[A]: devils tower

[Q]: What is the name of the main thoroughfare in Barcelona, which runs from the Placa de Catalunya to the sea?
[A]: barcelona

[Q]: The naval battle fought on 2 April 1801 known as the Battle of Copenhagen was fought between Denmark and a navy from where?
[A]:
battle of copenhagen