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.
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Question: Category: YOU'VE GOT SHE MAIL
Clue: In 1848 she wrote to Belgium's King Leopold, "Great events make me quiet and calm; it is only trifles that irritate my nerves"

Answer: victoria

Question: Category: AQUATIC-SOUNDING CINEMA
Clue: I know it's confusing, but in this movie sequel, Julia Roberts played Tess, who impersonated Julia Roberts

Answer: ocean's twelve

Question: Category: "FEE", "FI", "FO", "FUM"
Clue: It's the length a lens will go to work

Answer:
focus/focal length