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: 19th CENTURY LITERARY QUOTES 
Clue: This vessel under Captain Nemo was "cigar in shape" with "two hulls, one inside, the other outside"
[A]: the nautilus


[Q]: Category: DOUBLE TALK 
Clue: In the 1920s Donald Duncan introduced this child's toy to America & it's had its ups & downs ever since
[A]: yo-yo


[Q]: Category: TRAVEL AND TOURISM 
Clue: This city's World's Fair held in 1967 is perpetuated each summer under the title "Man and His World"
[A]:
montreal