Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Alexander Rook:  We 've nearly completed work on the new prototype .
Old Man: And what are you going to do about the other _ one _ ?
Alexander Rook: We do n't need her anymore .
Old Man: Her continued existence threatens ours . You say she has friends who assisted her ?
Alexander Rook: Yes .
Old Man: Do they know what she is ?
Alexander Rook: Yes .
Old Man: Then they 'll need to die too , Alex . All of them .

prototype