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: NATURE STUDY 
Clue: This tall shrub is prized for the reddish dye obtained from its leaves that's used to color hair

SOLUTION: henna

PROBLEM: Category: WORLD GEOGRAPHY 
Clue: This capital city is situated in the Judean Hills

SOLUTION: jerusalem

PROBLEM: Category: QUAY TO THE CITY 
Clue: A large stone quay built by the French in 1780 is still used in this capital of Haiti

SOLUTION:
port-au-prince