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: NYPD Detective Kate Beckett:  I hope this is for real , Castle . Because if it 's not , we 're shortchanging our John Doe .
Richard Castle: Oh , trust me . I ca n't believe you 've never heard of this place . I get all my costumes here .
Richard Castle: We
Richard Castle: can use this opportunity to find you _ one _ for my Halloween party .
Richard Castle: How
Richard Castle: about ... slutty nurse ?
NYPD Detective Kate Beckett: Fantasize all you want , Castle . I am not trying on costumes for you .

costumes