instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which current Broadway musical has a Japanese therapist character called Christmas Eve?
answer:
christmas eve

question:
Austin is the state capitol of which US State?
answer:
austin, texas

question:
Invented by Alexander Parkes in about 1856 and originally called Parkesine, what was the first thermo-plastic?
answer:
alexander parkes