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

Ex Input:
The wine-producing region of Hunter Valley is in which Australian state?

Ex Output:
australia

Ex Input:
From which musical did the song 'Chim Chim Cheree' come?

Ex Output:
chim chim cher-ee

Ex Input:
Which 19th century Austrian composer is famous for his waltzes such as The Blue Danube and Tales of the Vienna Woods, and the operetta Die Fledermaus?

Ex Output:
blue danube