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: AFRICA 
Clue: Central Africa's short people

A: the pygmies
****
Q: Category: ROOMMATES 
Clue: These Sesame Street Muppet roommates have shared an apartment since 1969

A:
bert & ernie
****