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

Ex Input:
Which Beatles song was also recorded by Peter Sellers?

Ex Output:
the beatles


Ex Input:
In 1951, which European country saw the abdication of King Leopold lll in favour of his son Baudouin?

Ex Output:
baudouin of belgium


Ex Input:
Who invented the cotton gin in 1783?

Ex Output:

cotton gin