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.

Category: PEN NAMES 
Clue: He came out of "The Jungle" to write juvenile novels as Clarke Fitch
upton sinclair

Category: WHAT SHOULD I "DU"? 
Clue: A philosophical system that seeks to explain all phenomena in terms of 2 distinct principles
dualism

Category: FAMOUS FEMALES 
Clue: Known as "The Queen of Independent Films", she was named for model Suzy

parker posey