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: AIRLINE AD SLOGANS 
Clue: "The world's favourite airline"
[A]: british airways


[Q]: Category: POP CULTURE: 1999 
Clue: A tongue-in-cheek tribute on the Emmy Awards featured the many deaths of this animated character
[A]: kenny


[Q]: Category: CARBON CREDITS 
Clue: The atoms in a diamond are arranged in this "4-faced" pyramid-shaped pattern, giving it a rigid structure
[A]:
tetrahedral