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.

[Q]: Category: BIG CITY LIFE 
Clue: The beginning of this regulation of land & building use dates from a 1916 New York City ordinance
[A]: zoning


[Q]: Category: HORSE RACING 
Clue: In 1711 Queen Anne saw the potential for this racecourse; its royal enclosure still has a formal dress code
[A]: ascot


[Q]: Category: CARS 
Clue: Showing its "age", this 106-year-old GM line of cars sent its last one off the assembly line in 2004
[A]:
oldsmobile