TASK DEFINITION: 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.
PROBLEM: Category: OPERA 
Clue: This 20th century opera was inspired by Hieronymus Bosch's painting "The Adoration of the Magi"

SOLUTION: amahl and the night visitors

PROBLEM: Category: WORLD HISTORY 
Clue: City that was the seat of government of the viceroyalty of New Spain

SOLUTION: mexico city

PROBLEM: Category: SCIENCE FICTION 
Clue: The idea for these TV creatures sprang from rabbits in Australia that multiplied at an incredible rate

SOLUTION:
tribbles