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: SAME FIRST & LAST LETTER 
Clue: It's the last name of TV's SpongeBob

SOLUTION: squarepants

PROBLEM: Category: GOAT-POURRI 
Clue: Goat Island splits Niagara Falls into the American Falls & this waterfall on the Canadian side

SOLUTION: horseshoe falls

PROBLEM: Category: SCULPTURE 
Clue: 16th c. German sculptor Tilman Riemenschneider worked some in stone but mainly in this

SOLUTION:
wood