instruction:
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.
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: MUSEUMS OF GERMANY 
Clue: A Baden-Baden museum devoted to the works of this Russian imperial jeweler opened in 2009
answer:
fabergé


question:
Category: TO PROTECT 
Clue: This "service" is best known for protecting the president, but also investigates forgery
answer:

the secret service