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

Ex Input:
Which poem by Keats and novel by Disraeli both have the same title?

Ex Output:
john keats


Ex Input:
In which constellation is the star Deneb?

Ex Output:
deneb


Ex Input:
What arcade game involves an amphibian trying to cross a busy street?

Ex Output:

arcade game