TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.
PROBLEM: Category: A PARIS CHRONOLOGY 
Clue: Paris was founded around 250 B.C. by the Celtic Parisii tribe, who built a settlement on an island in this river

SOLUTION: the seine

PROBLEM: Category: WITCHCRAFT 
Clue: Until Dorothy showed up, these small folks toiled as slaves for Oz' Wicked Witch of the East

SOLUTION: munchkins

PROBLEM: Category: IMPERSONATORS 
Clue: Lucille Ball was the mirror image of this Marx Brother when she impersonated him on "I Love Lucy"

SOLUTION:
harpo marx