instruction:
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.
question:
Category: THE 19th CENTURY 
Clue: 1853 purchase that brought the contiguous U.S. about up to its present area
answer:
the gadsden purchase


question:
Category: JACK LEMMON FILMS 
Clue: In "The China Syndrome", Lemmon played the executive of this type of plant
answer:
nuclear power plant


question:
Category: G.I. JOE 
Clue: In the '80s this pro wrestler with a rank in his name became the first real person to join the G.I. Joe corps
answer:

sgt. slaughter