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.
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Question: Category: SINGING ACTORS 
Clue: In 2001 this Oscar winner sang "Angelina", a romantic tribute to his fifth wife, on his album "Private Radio"

Answer: billy bob thornton


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: ETIQUETTE 
Clue: It's the only fork ever placed to the right of the plate

Answer:
a cocktail fork