instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What is the alcoholic ingredient of a Screwdriver cocktail?
answer:
screwdriver


question:
Which Chuck Berry song is performed by Marty McFly at the end of the film Back to the Future?
answer:
back to the future


question:
The cravat was a predecessor to what modern garment?
answer:

cravat