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

Ex Input:
Harry, Tom, Dougie and Danny are collectively known as who in the pop world?

Ex Output:
dougie poynter


Ex Input:
What city is closest to Copacabana beach?

Ex Output:
copacabana, rio de janeiro


Ex Input:
Can you name the actress who links 'The Darling Buds of May' and 'Rosemary and Thyme'?

Ex Output:

the darling buds of may