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

[EX Q]: Category: '50s TV 
Clue: In "Have Gun, Will Travel", Richard Boone played this dapper gun-for-hire based in San Francisco's Hotel Carlton
[EX A]: paladin

[EX Q]: Category: A SNAKE IN THE CATEGORY 
Clue: In mythology, the Ouroboros is a snake or dragon with this in its mouth
[EX A]:
its tail