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

SOLUTION: dingo

PROBLEM: Category: "R"RRRRR! 
Clue: Frank Gorshin played him on the small screen, Jim Carrey on the big

SOLUTION: the riddler

PROBLEM: Category: U.S. HISTORY 
Clue: Though he left the service after WWII as a captain, today he holds the highest rank possible

SOLUTION:
ronald reagan