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

Ex Input:
In which country did the dance The Czardas originate?

Ex Output:
csardas


Ex Input:
Which analgesic drug, first isolated in 1804, was named after the Greek god of dreams ?

Ex Output:
analgesic


Ex Input:
What is the name of the mausoleum near Windsor where Queen Victoria and Prince Albert are buried?

Ex Output:

albert