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: QUEEN ELIZABETH II 
Clue: It's Queen Elizabeth's official London residence
[EX A]: buckingham palace

[EX Q]: Category: THE ROMAN EMPIRE 
Clue: The noble class in Roma, its name may be from the Latin for father
[EX A]: patrician

[EX Q]: Category: 3-LETTER WORDS 
Clue: Sushi-wise, uni is this from sea urchins
[EX A]:
roe