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: FOUNDERS 
Clue: In 1958 former high school principal Dr. Ethel Andrus founded this group, the AARP
[EX A]: american association of retired persons

[EX Q]: Category: SIGNS & SYMBOLS 
Clue: Symbols of mystery, they're the mysterious doubles of the people who cast them
[EX A]: shadows

[EX Q]: Category: 20th CENTURY AUTHORS 
Clue: Ayn Rand once cited this late Mike Hammer author as her favorite popular writer
[EX A]:
mickey spillane