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: NATIVE AMER. WOMEN 
Clue: Even after their marriage ended, this Osage Indian was still Balanchine's Sugar Plum Fairy
[EX A]: tallchief

[EX Q]: Category: "W"HODUNNIT? 
Clue: He was the first U.S. president to be unanimously elected
[EX A]: george washington

[EX Q]: Category: BIOLOGY 
Clue: In this process 8 photons of light break down 2 H2O molecules to yield an O2 molecule
[EX A]:
photosynthesis