TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Who composed Air on the G String?

SOLUTION: air on the g string

PROBLEM: Kronos (or Cronus) was the Greek equivalent of which Roman god?

SOLUTION: cronus

PROBLEM: Ewart was the middle name of which British Prime Minister?

SOLUTION:
prime minister of the united kingdom