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.

[EX Q]: Category: NATURE STUDY 
Clue: This tall shrub is prized for the reddish dye obtained from its leaves that's used to color hair
[EX A]: henna

[EX Q]: Category: PLACES OF INCARCERATION 
Clue: "Shark Island" Prison is part of Dry Tortugas National Park in the extreme southwest of this state
[EX A]: florida

[EX Q]: Category: HOUSEPLANTS 
Clue: Unlike many plants, these, which include the barrel & snowball types, prefer to get completely dry
[EX A]:
cacti