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 consistency, answers should be in all lower cased letters.

[Q]: Category: YOU NEED THERAPY 
Clue: In the hyperbaric type of this "therapy", the patient inhales the pure gas in a large chamber
[A]: oxygen


[Q]: Category: JOE THE PLUMBER 
Clue: Joe knows how to "assemble" 2 words into this 1-word toilet part by combining comedienne Lucille & a male chicken
[A]: a ballcock


[Q]: Category: THE HOLE TRUTH 
Clue: Jackson Hole, a valley in this national park, was once a separate national monument
[A]:
grand teton national park