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: BOOKISH 
Clue: Her novel "One Fifth Avenue" offers more sex in the same city

SOLUTION: bushnell

PROBLEM: Category: ANIMALS 
Clue: These mollusks, not oysters, are the most common source for freshwater pearls

SOLUTION: mussels

PROBLEM: Category: ANCIENT TIMES 
Clue: Roman slave famous for broaching a "thorny" subject with a lion

SOLUTION:
androcles