instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
What name was given to the 1950-60s mainstream country music style of artists including Patsy Cline, Tammy Wynette, Jim Reeves, and Charlie Rich?
answer:
charlie rich


question:
Carpo and Elara are moons of which planet?
answer:
elara


question:
What nationality was Christopher Columbus?
answer:

christopher columbus