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: 20th CENTURY AUTHORS 
Clue: Ayn Rand once cited this late Mike Hammer author as her favorite popular writer
mickey spillane

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

Category: ALEX IN AFRICA 
Clue: An unmarked coat below the knee is a trait of the giraffe subspecies named this, like an international banking family

rothschild giraffe