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: MEN OF MEDICINE 
Clue: After giving birth in Paris, American Marjorie Karmel wrote "Thank You" him & co-founded an orgianization now named for him
fernand lamaze

Category: ASTRONOMER'S DICTIONARY 
Clue: This word comes from a Greek phrase meaning "circle of animals"
zodiac

Category: U.S. HISTORY 
Clue: A 1924 law gave citizenship to all these members of what were called "domestic dependent nations"

native americans