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

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

Eden Park staged some of the 2011 Rugby World Cup matches, in which city can it be found?
eden park

August 28, 1898 saw the introduction of what popular soft drink, originally called Brad's Drink, named after it's inventor, New Bern, NC pharmacist Caleb Bradham?

brad's drink