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

Ex Input:
What is the alcoholic ingredient of a Screwdriver cocktail?

Ex Output:
screwdriver


Ex Input:
Princess Estelle, Duchess of Ostergotland, granddaughter to King Carl XVI Gustaf, became 2nd in line to what nation's throne when born in 2012?

Ex Output:
carl xvi gustaf of sweden


Ex Input:
Which US state borders Canada and the Connecticut River, and has the Green Mountains running through its centre?

Ex Output:

connecticut river