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: YOU GET AN "F" 
Clue: These seedless, nonflowering plants reproduce by spores on the undersides of their fronds

SOLUTION: ferns

PROBLEM: Category: ROYAL WOMEN 
Clue: Nori, his daughter, only fit the category until Nov. 15, 2005, when she married a commoner

SOLUTION: akihito

PROBLEM: Category: REALLY BIG 
Clue: With its supporting roots & trunks, a single one of these trees in India covers some 3 acres

SOLUTION:
banyan