instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
With which song did Swedish pop group Abba win the 1974 Eurovision Song Contest?
answer:
abba


question:
Who directed the film `Back To The Future`?
answer:
back to the future


question:
Which British Prime Minister, who was born in Portsmouth in March 1912, died on March 26th 2005 aged 92 ?
answer:

prime minister of the united kingdom