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.

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
the seine

Category: "G" WHIZ 
Clue: According to the nursery rhyme, if you were born on a Tuesday, you're full of it
grace

Category: STATE FAIRS 
Clue: A demolition one is a feature of state fairs including Kansas' & Indiana's (but not Kentucky's)

a derby