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.

[Q]: Category: EARLY ART 
Clue: This art form of setting stones or glass into mortar was the main decorative art of the Byzantine Empire
[A]: mosaic


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


[Q]: Category: CELEBRITY MEMOIRS 
Clue: "Growing Up Again", this TV star's memoir, is subtitled "Life, Loves, and oh yeah, Diabetes"
[A]:
mary tyler moore