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 popular animated characters, first seen in 1996 include many different characters including ones called Ash Ketchum, Tracy Sketchit and Gar Oak?

SOLUTION: tracy

PROBLEM: Princess Estelle, Duchess of Ostergotland, granddaughter to King Carl XVI Gustaf, became 2nd in line to what nation's throne when born in 2012?

SOLUTION: carl xvi gustaf of sweden

PROBLEM: In what sport is Arnold Palmer known?

SOLUTION:
arnold palmer