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

Example Input: With which song did Swedish pop group Abba win the 1974 Eurovision Song Contest?
Example Output: abba

Example Input: Everything Changes, Beautiful World and Circus are all albums released by which British band?
Example Output: beautiful world

Example Input: Who was the author of the literary work 'A Mask presented at Ludlow Castle, 1634' a work more commonly known as 'Comus'?
Example Output:
comus