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: MR. AND MRS. SMITH 
Clue: An annual festival in Sydney, Australia honors Maria Smith, the originator of this famous apple

SOLUTION: the granny smith apple

PROBLEM: Category: TOUGH BODIES OF WATER 
Clue: Finland's Aland Islands lie at the southern edge of this gulf

SOLUTION: the gulf of bothnia

PROBLEM: Category: WHERE, OH WHERE? 
Clue: The waterfront of this Omani capital is dominated by the palace of Sultan Qaboos Bin Said

SOLUTION:
muscat