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 consistency, answers should be in all lower cased letters.
question:
Category: ENDS IN "FF" 
Clue: The heaviest of dog breeds, it can exceed 180 pounds
answer:
mastiff


question:
Category: WE'VE GOT ISSUES 
Clue: Hopefully this magazine with editor-in-chief Rosemary Ellis earned its own seal of approval
answer:
good housekeeping


question:
Category: THE COMMODORES 
Clue: Negotiated by Matthew Perry, 1854's Treaty of Kanagawa opened up this country to commercial trade with the U.S.
answer:

japan