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: HALOGENS 
Clue: A reddish liquid, this halogen is often used to make sedatives & was once used to make EDB, an additive in lead gasoline
[A]: bromine


[Q]: Category: GET AN EDUCATION! 
Clue: God willing, you'll learn enough about religion to know this word defined as belief in a single god
[A]: monotheism


[Q]: Category: A WORLD OF PLAYWRIGHTS 
Clue: Aeschylus' most "oresting" work may be this Greek trilogy about the house of Atreus
[A]:
the orestia