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

Ex Input:
Established in 1919, which is the world's oldest surviving airline?

Ex Output:
airline


Ex Input:
Food writer and critic Egon Ronay, who died in 2010, was born in what country, which offers a food related pun?

Ex Output:
egon ronay


Ex Input:
Cluj-Napoca and Timisoara are respectively the second and third biggest cities in which European country?

Ex Output:

cluj-napoca