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 consistency, answers should be in all lower cased letters.
question:
Category: WHO'S THE MRS.? 
Clue: Mrs. James Carville
answer:
matalin


question:
Category: ENGINEERING 
Clue: The motto of this 1904-1914 engineering project was "The land divided, the world united"
answer:
the panama canal


question:
Category: THERE'S A FIRST TIME FOR EVERYTHING 
Clue: Probably the first emergency use of this device was on January 15, 1878 to alert doctors to a train wreck
answer:

the telephone