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: U.S. GOVERNMENT FIRSTS 
Clue: The first of these was authorized in 1790, "providing for the enumeration of the inhabitants of the United States"
[A]: a census


[Q]: Category: ASTRONOMER'S DICTIONARY 
Clue: This word comes from a Greek phrase meaning "circle of animals"
[A]: zodiac


[Q]: Category: 20th CENTURY NOVELS 
Clue: Ironically, this 1953 science fiction book began appearing in a censored version in 1967
[A]:
fahrenheit 451