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: Kate Beckett:  Hey , Lanie . What 's up ?
Lanie Parish: Your cause of death . The poison was a chemically synthesized , weaponized agent similar to the organic compound saxitoxin .
Kate Beckett: Saxitoxin ?
Lanie Parish: Mm - hm . It usually occurs in shellfish , but not this version . Whoever created this had access to a pretty sophisticated lab , and this _ one _ 's been supercharged . Speaking of supercharged , is it true that you 're with Eric Vaughn ? I mean , Kate , I know you love Castle and all , but girlfriend ...
Kate Beckett: Bye , Lanie .

poison