instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which is the largest continent on Earth?
answer:
earth

question:
Which British Prime Minister delivered the 'Winds of Change' speech in 1960?
answer:
wind of change

question:
Who composed the songs Old Folks at Home and Beautiful Dreamer?
answer:
old folks at home