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.

Category: EUROPEAN LANGUAGES 
Clue: In this language spoken by 120 million worldwide, all of the days of the week but one end with the same 3 letters
german

Category: PSYCHOLOGY TERMS 
Clue: This 2-word term has its origins in a hostage-taking that followed the botched 1973 Norrmalmstorg bank robbery
stockholm syndrome

Category: WORD ORIGINS 
Clue: Like the name of a minor Roman god, this word for a caretaker comes from the Latin for "door"

janitor