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: MONEY, MONEY, MONEY 
Clue: In 1970 this Japanese currency was at 360 to the dollar; today it's under 100
the yen

Category: HISTORIC QUOTES 
Clue: This great Prussian king is credited with saying, "An army, like a serpent, travels on its belly"
frederick the great

Category: TV TWINS 
Clue: These former "Full House" twins have their own line of home video mystery adventures

mary-kate & ashley olsen