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 has written a series of novels, entitled The Dark Tower, of which the first, in 1982, was entitled, The Gunslinger?

SOLUTION: the dark tower

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

SOLUTION: boxing

PROBLEM: What Carl Sagan television series was resurrected in 2014 with Neil deGrasse Tyson as host?

SOLUTION:
carl sagan