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.
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Question: Category: MOTHER GOOSE 
Clue: It's the type of nail referred to in the nursery rhyme "All for Want of a Nail"

Answer: a horseshoe nail


Question: Category: YOU NEED THERAPY 
Clue: In the hyperbaric type of this "therapy", the patient inhales the pure gas in a large chamber

Answer: oxygen


Question: Category: VICE PRESIDENT... THE SITCOM! 
Clue: On a very special episode, this Virginian's run as the first Whig VP comes to a stunning end

Answer:
tyler