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.

Category: IRISH-BORN AUTHORS 
Clue: Once a drama critic in his native Dublin, he toured the U.S. as an actor's manager, but never visited Romania
bram stoker

Category: THE 20th CENTURY 
Clue: In the 1940s Franklin Roosevelt coined this term in reference to all the countries allied against the Axis powers
united nations

Category: SCIENTIFIC INSTRUMENTS 
Clue: French physicist Leon Foucault gave it its name, which is from the Greek for "to view the rotation"

gyroscope