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: Kemp:  Last week you received a sample of blood , yes ?
Lucy: Yeah . We get a lot of those here .
Kemp: This _ one _ you 'd remember . You ran it through your machines and the readings made no sense . You would have checked it several times and then perhaps blamed your machine .
Lucy: What was it ?
Kemp: Evil .

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