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: INTERNATIONAL ROAD VEHICLE STICKERS 
Clue: SGP
singapore

Category: ANIMALS 
Clue: Also called a warrigal, this wild dog is one of the few nonmarsupial mammals of Australia
dingo

Category: NOT TO BE CONFUSED 
Clue: Before entering a chateau, you might remove your chapeau, which is one of these

a hat