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

Ex Input:
Grace Anna Goodhue was the wife of which US President?

Ex Output:
grace coolidge


Ex Input:
Who bad a number 1 in the 1980's with Circle in the Sand?

Ex Output:
circle in the sand


Ex Input:
The cocktail 'blue lagoon' includes what alcoholic spirit?

Ex Output:

blue lagoon