instruction:
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.
question:
Category: TOYMAKERS 
Clue: In 1997 Mattel sued Miller'$, a magazine devoted to this fashion doll, for copyright infringement
answer:
barbie


question:
Category: COLLEGE SPORTS TEAM NICKNAMES 
Clue: Penn State
answer:
nittany lions


question:
Category: CASTLES 
Clue: Once home to the Knights of the Sword, Riga Castle is today the official residence of the president of this Baltic country
answer:

latvia