instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What type of creature is an argali?
answer:
argali


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:
Which country music performer was portrayed by Sissy Spacek in the 1980 biographical film 'Coal Miner's Daughter'?
answer:

sissy spacek