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.

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

[EX Q]: Category: TRANSPORTATION 
Clue: An aircraft that can take off & touch down on water or land is called this, like a class of animals
[EX A]: amphibious

[EX Q]: Category: ELDERS IN ENTERTAINMENT 
Clue: In 2007, soon after his mother's death, this rapper struggled to get through "Hey Mama" on stage
[EX A]:
kanye west