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

[Q]: The Briish Airways subsidiary BA Connect was sold to which other airline?
[A]: airline


[Q]: Who won the Women's Singles at the 2015 Australian Open Tennis Championships?
[A]: the championships, wimbledon


[Q]: Which German composer's only opera was 'Fidelio'?
[A]:
composer