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

Example input: Who was the first American President?
Example output: president of the united states
Example explanation: The question talks about the president of the USA.
Q: 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?
A:
brad's drink