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: TECHNOLOGY 
Clue: In 1913 this alloy was invented by Harry Brearley of Sheffield, England, a city known for its cutlery since before 1400
[A]: stainless steel


[Q]: Category: NATURE 
Clue: The propagation of oak trees depends on the lousy memories of these animals
[A]: squirrels


[Q]: Category: U.S. HISTORY 
Clue: In 1992 Nathan E. Cook, the last veteran of this war, died
[A]:
the spanish-american war