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 simplicity, answers should be in all lower cased letters.
PROBLEM: Category: U.S. GOVERNMENT FIRSTS 
Clue: The first of these was authorized in 1790, "providing for the enumeration of the inhabitants of the United States"

SOLUTION: a census

PROBLEM: Category: THE OSCARS 
Clue: Only Pulitzer Prize-winning novels to become Oscar-winning “Best Pictures” are “All The King's Men” & this one

SOLUTION: gone with the wind

PROBLEM: Category: U.S. CITIES 
Clue: This city's flag shows 2 rivers joining behind a fleur-de-lis

SOLUTION:
st. louis