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.

[Q]: Category: WOMEN WRITERS 
Clue: Mary Chesnut's take on this U.S. war was part of a Ken Burns TV documentary
[A]: the civil war


[Q]: Category: STARRY NIGHT 
Clue: The helix nebula is in this constellation, whose "arm" holds 5 stars suggesting a water pitcher
[A]: aquarius


[Q]: Category: MAGAZINES 
Clue: American Turf Monthly has been following & promoting this sport since 1946
[A]:
horse racing