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: PREHISTORIC TIMES 
Clue: The Stone Age lasted until this metal replaced stone as the primary tool-making material

SOLUTION: bronze

PROBLEM: Category: OH, THE HUMANITIES! 
Clue: Bach did most of his composing for this Protestant denomination

SOLUTION: lutheran

PROBLEM: Category: COUNTRIES OF THE WORLD 
Clue: About 90% of the people of this country which borders Burundi on the north are Hutu, about 9% Tutsi

SOLUTION:
rwanda