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

Ex Input:
What is the name of the astromech droid companion of Anakin Skywalker, Luke Skywalker and Obi-Wan Kenobi in the Star Wars franchise?

Ex Output:
droid


Ex Input:
Cinder Cone, composite, and shield are all types of what?

Ex Output:
cinder cone


Ex Input:
The German Imannuel Kant, Englishman Bertrand Russell, and American John Dewey, were notable?

Ex Output:

bertrand russell