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

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

Ex Output:
analgesic


Ex Input:
Come Clean was the debut album by which 2000s band?

Ex Output:
come clean


Ex Input:
The 2008 film The Curious Tale of Benjamin Button' was adapted from a short story by whom?

Ex Output:

the curious case of benjamin button