Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

[EX Q]: Which group had a top ten hit with 'Driving in My Car' in 1982?
[EX A]: driving in my car

[EX Q]: Kronos (or Cronus) was the Greek equivalent of which Roman god?
[EX A]: cronus

[EX Q]: Which 20th century British prime minister had the longest surname ?
[EX A]:
prime minister of the united kingdom