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

Ex Input:
Which former Blue Peter presenter died in April 2004, aged 41?

Ex Output:
blue peter

Ex Input:
Which actor spoke the line I love the smell of napalm in the morning* in the 1979 film Apocalypse Now?

Ex Output:
apocalypse now

Ex Input:
Betty Driver played which role in Coronation Street?

Ex Output:
betty driver