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: RULERS 
Clue: In 770 this king of the Franks married Desiderata, daughter of the Lombard king Desiderius
[EX A]: charlemagne

[EX Q]: Category: "O" YOU ANIMAL! 
Clue: It "coughs" out sediment by clapping its shell shut
[EX A]: oyster

[EX Q]: Category: PHILOSOPHERS 
Clue: A Florida city is named for this medieval author of "The City of God"
[EX A]:
st. augustine