TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Which of these was the title of Bobby Darin's first million selling single?

SOLUTION: bobby darin

PROBLEM: In which US state are the Catskill Mountains?

SOLUTION: catskill mountains

PROBLEM: In which film did Noel Coward play Captain E V Kinross and Celia Johnson his wife Alix?

SOLUTION:
celia johnson