Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
One example is below.
Q: Who was the first American President?
A: president of the united states
Rationale: The question talks about the president of the USA.
Q: Invented by Alexander Parkes in about 1856 and originally called Parkesine, what was the first thermo-plastic?
A:
alexander parkes