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.

Category: HEAVY MACHINERY 
Clue: By definition it's a machine that gives a surface an even degree of slope
grader

Category: MOVIE GEOGRAPHY 
Clue: The Errol Flynn western named for this Kansas town inspired the plot of Mel Brooks' "Blazing Saddles"
dodge city

Category: 19th CENTURY LIT 
Clue: Chapters in this novel include "Hester at Her Needle" & "Hester and Pearl"

"the scarlet letter"