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
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Q: Category: SEEING THE LIGHT 
Clue: "The sun's coming up"?  No, this character says, "Envious streaks do lace the severing clouds in yonder east"

A: romeo
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Q: Category: TECHNOLOGY 
Clue: As its name implies, a hydrophone is used to detect sound here

A:
in the water
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