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: Dr. Temperance 'Bones' Brennan:  Sweets ... has scars on his back . Old _ one _ .
Dr. Gordon Wyatt: Really ?
Special Agent Seeley Booth: What kind of scars ?
Dr. Temperance 'Bones' Brennan: Like he 'd been whipped .
Special Agent Seeley Booth: Whipped ?
Dr. Temperance 'Bones' Brennan: I saw them .
Dr. Gordon Wyatt: That explains his near obsession with your childhood trauma .

scars