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: Eddie Jones was appointed head coach of which English sporting team in 2015?

SOLUTION: eddie jones

PROBLEM: Rigel and Betelgeuse are in which constellation?

SOLUTION:
rigel