instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Christopher Eccleston, Kerry Fox and Ewan McGregor played flatmates in which 1994 film?
answer:
christopher eccleston

question:
Formerly known as Sky Dome, Rogers Centre is home to what American League baseball team, the only MLB team located outside the United States?
answer:
american league

question:
Which singer was played by Diana Ross in the 1972 film 'Lady Sings The Blues'?
answer:
lady sings the blues