instruction:
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.
question:
Category: PLAYWRIGHTS 
Clue: In 1979 this author of "Streamers" married Jill Clayburgh
answer:
david rabe


question:
Category: LET'S GET SMALL 
Clue: In area, it's the smallest constitutional monarchy in the world
answer:
monaco


question:
Category: SPORTS 
Clue: Football's imaginary plane which neither team may cross until the ball is snapped
answer:

the line of scrimmage