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: PUBLISHING 
Clue: After 7 years of planning, this magazine published a condensed version of the Bible in 1982
reader\'s digest

Category: YOU ARE SO FOXY! 
Clue: The foxglove plant is the main source of this medicine used as a stimulant  in damaged heart tissue
digitalis

Category: DESERTS 
Clue: The world's largest unbroken expanse of sand is the Rub Al-Khali, or "Empty Quarter", of this desert

the arabian desert