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

Ex Input:
Which horse won the 2009 Epsom Derby?

Ex Output:
2009 epsom derby


Ex Input:
Bound for Glory is the 1943 autobiography of which singer-songwriter?

Ex Output:
bound for glory


Ex Input:
In which Australian state is the city of Mount Isa, famous for its mineral deposits?

Ex Output:

city of mount isa