TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: Grace Anna Goodhue was the wife of which US President?

SOLUTION: grace coolidge

PROBLEM: Who achieved fame for his ,'Confessions Of An English Opium Eater'?

SOLUTION: confessions of an english opium-eater

PROBLEM: Which US animated television series 90 second pilot episode clip was called the 'Flagstones'?

SOLUTION:
animated series