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.

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

Output: grader

Input: Consider Input: Category: FICTIONAL CHARACTERS
Clue: Lassiter is the gun-slinging hero of this Zane Grey novel & appears in its sequel "The Rainbow Trail"

Output: "riders of the purple sage"

Input: Consider Input: Category: CELEBRITY LIVES
Clue: "Mercy, Mercy Me", a biography of this singer, was published in 2004 to coincide with the 20th anniv. of his death
Output: marvin gaye