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: PREHISTORIC TIMES 
Clue: The Stone Age lasted until this metal replaced stone as the primary tool-making material

Answer: bronze


Question: Category: CINEMA 
Clue: Vangelis' theme from this 1981 British film took a record 21 weeks on the charts to reach No. 1

Answer: "chariots of fire"


Question: Category: "SET" 'EM UP 
Clue: 3-part command that begins a footrace

Answer:
"on your mark!, get set!, go!"