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: U.S. RIVERS 
Clue: The Falls of Saint Anthony stop this mighty river from being navigable north of St. Paul, Minnesota
answer:
the mississippi


question:
Category: HOLIDAYS 
Clue: "(Hi, I'm Chuck Woolery)  You can send a card to your sweetheart or anyone in your 4th grade class on this February holiday"
answer:
valentine\'s day


question:
Category: WEST ON THE MAP 
Clue: Buckingham Palace is in this borough of London
answer:

westminster