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 was the only boxer to win a world title without ever having a manager?

SOLUTION: boxing

PROBLEM: Which English king was the son of Edward, the Black Prince?

SOLUTION: edward, the black prince

PROBLEM: Who shaved her head to play the character Lt Ellen Ripley in the 1992 film 'Alien3'?

SOLUTION:
alien 3