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: Lanie Parish:  He was definitely dead .
Dr. Rebecca Ellins: That 's what you said last time .
Lanie Parish: He was dead the last time , too .
Kate Beckett: Uh , sorry , um ... can we have a minute , please ?
Dr. Rebecca Ellins: Of course .
Kate Beckett: Thanks .
Lanie Parish: I 'm sorry . I 'm just rattled . You know , people can come back from being poisoned and from being electrocuted , but both in the same day ?
Kate Beckett: So , is there an explanation ?
Lanie Parish: I can think of _ two _ . Either I 'm really bad at my job or Castle 's right and this guy is immortal .
Kate Beckett: He is not immortal , and you are a genius at your job . We just got to keep looking for answers , starting with who wants to kill this guy so badly .

explanation