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: ANIMALS 
Clue: Also called a warrigal, this wild dog is one of the few nonmarsupial mammals of Australia
dingo

Category: FREUD 
Clue: The one great question Freud said he could not answer was "What does" one of these "want?"
a woman

Category: ECUADOR OF YORE 
Clue: Guayaquilenos with sensitive noses were pleased when in 1910 vehicles powered by this replaced quaint horse-drawn trams

electricity