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.

[EX Q]: Category: ANIMAL VERBS 
Clue: Nag or pester persistently
[EX A]: badger

[EX Q]: Category: GOAT-POURRI 
Clue: Goat Island splits Niagara Falls into the American Falls & this waterfall on the Canadian side
[EX A]: horseshoe falls

[EX Q]: Category: WOMEN AUTHORS 
Clue: This author who battled Alzheimer's in her final years was the subject of the movie "Iris"
[EX A]:
iris murdoch