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: SPORTS 
Clue: Football's imaginary plane which neither team may cross until the ball is snapped
answer:
the line of scrimmage


question:
Category: TOUGH GEOGRAPHY 
Clue: Monte Cervino is the Italian name for this peak, located in the Alps & copied in Anaheim
answer:
the matterhorn


question:
Category: SUBATOMIC MASS PERSUASION 
Clue: In 1998 it was found that these particles that pass through everything at light speed do have mass
answer:

neutrinos