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

Answer: grader


Question: Category: MOVIE TWINS 
Clue: In "Twins" Arnold Schwarzenegger played a genius fluent in 12 languages; this actor played his con man twin

Answer: danny devito


Question: Category: NOVELS' FIRST LINES 
Clue: "It was Wang Lung's marriage day."

Answer:
the good earth