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

Ex Input:
Cassandra, Grizabella and Skimbleshanks are all characters in which Andrew Lloyd Webber musical?

Ex Output:
andrew lloyd webber


Ex Input:
Who directed the 2005 film 'Brokeback Mountain'?

Ex Output:
brokeback mountain


Ex Input:
Which romantic film directed by David Lean is set in World War 2 and based in and around Milford railway station?

Ex Output:

david lean