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: FULL "MOON" 
Clue: Mercer & Mancini composed this 1961 classic
"moon river"

Category: FOUNDERS 
Clue: In 1958 former high school principal Dr. Ethel Andrus founded this group, the AARP
american association of retired persons

Category: "CEL"EBRITY WORDS 
Clue: Originally this word meant "unmarried"; its other meaning is a more recent development

celibate