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.

Category: IRISH EYES 
Clue: Hey, 20 bucks says that you know this president's father was from County Antrim & his mother was Irish, too
andrew jackson

Category: THE THEATRE 
Clue: Playwright Jean Anouilh had a lot at "stake" with "L'Alouette", his play about this female saint
joan of arc

Category: OF "OZ" 
Clue: A type of large tractor

a bulldozer