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: A "THORN"-Y CATEGORY 
Clue: He replaced Edwin Meese as Attorney General
dick thornburgh

Category: HANNA-BARBERA DOGS 
Clue: In one episode of the original "Jetsons", a millionaire tried to take him away
astro

Category: ACTORS & ACTRESSES 
Clue: This "Fair Lady" of film starred on Broadway in a non-musical version of "Gigi" in 1951

audrey hepburn