instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What hit song by the Crash Test Dummies comprised four three-letter words all containing the same letter?
answer:
crash test dummies

question:
Allopurinol is typically prescribed for which illness?
answer:
allopurinol

question:
Which Mountain Pass provides a route between Kentucky and Tennessee via the Appalachians?
answer:
appalachian mountains