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: THE ELEMENTS 
Clue: Most fluorescent lights are filled with a combination of argon & this element, Kr
[A]: krypton


[Q]: Category: START SAVING NOW 
Clue: This $1.5 billion dollar telescope, seen here, has opened our Earth-bound eyes to undreamed-of splendors
[A]: the hubble space telescope


[Q]: Category: WHAT AILS YOU? 
Clue: Don't ignore that tenderness in the right lower abdomen -- this useless organ could rupture if untreated
[A]:
the appendix