Instructions: 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: Dr. Temperance 'Bones' Brennan: You think I do n't recognize an experiment when I see _ one _ ? You experimented on us !
Dr. Lance Sweets: Beg you pardon ?
Dr. Temperance 'Bones' Brennan: Not telling me Booth was alive , you wanted to quantify our reactions for your research . You took advantage of us . Booth and I agreed to let you observe us . We did not agree to be used as lab rats . So you * better * cut it out !
Dr. Lance Sweets: Dr. Brennan why are you talking so fast ?
Dr. Temperance 'Bones' Brennan: Because if Booth hears why you did what you did , he 'd beat you up .
Dr. Lance Sweets: Do n't you think that would be an overly aggressive act ?
Dr. Temperance 'Bones' Brennan: Not at all . So you better not do it again !
Output:
experiment