TASK DEFINITION: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
PROBLEM: What name is given to the disease whereby parasites can change the behaviour of rats and mice, making them drawn to rather than fearful of the scent of cats?

SOLUTION: cat

PROBLEM: In which US state would you find the cities of Chesapeake, Roanoke and Fredericksburg?

SOLUTION: fredericksburg

PROBLEM: Who was the first chairman of BBC TV's Call My Bluff?

SOLUTION:
call my bluff