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.

[Q]: 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"
[A]: victoria


[Q]: Category: PARTICLE PHYSICS 
Clue: To get an element's mass number, add its protons & these
[A]: neutrons


[Q]: Category: "GREAT" EXPECTATIONS 
Clue: A Montana city is named for these on the Missouri, which Meriwether Lewis called the grandest sight he'd ever beheld
[A]:
great falls