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

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

Which European country has the Cupon as its currency?
moldovan cupon

Which American group is made up of will.i.am, apl.de.ap, Taboo and Fergie?

fergie