instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which popular animated characters, first seen in 1996 include many different characters including ones called Ash Ketchum, Tracy Sketchit and Gar Oak?
answer:
tracy

question:
In which bay is Alcatraz?
answer:
alcatraz island

question:
Who commanded the Union Army at the Battle of Gettysburg?
answer:
union army