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

Ex Input:
'Edward Lewis' and 'Vivian Ward' were the principal characters in which popular 1990 film?

Ex Output:
edward lewis

Ex Input:
Which mediaeval author wrote The Canterbury Tales?

Ex Output:
the canterbury tales

Ex Input:
Australian Capital Territory is entirely surrounded by what state?

Ex Output:
australia