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.

Q: Ted Mosby:  Look , there 's a fine line between love and insanity . It 's the Dobler - Dahmer theory .
Lily Aldrin: Damn , I always forget the little _ one _ !
Ted Mosby: All right . If both people are into each other , a big romantic gesture works . Like Lloyd Dobler holding up the boom box outside Dianne Court 's window in Say Anything . But if one person is n't into the other , the same gesture comes off serial - killer crazy , or Dahmer .

A: theory
****
Q: Poisandra:  He fried my brain .
Curio: Luckily , I do n't have _ one _ .

A: brain
****
Q: Bradley Buzzcut:  Alright , what 's the square root of 9 ? Beavis and Butt - head ! Do you know the answer ?
Butt-head: Uh ... could you like , repeat the question a few times ?
Bradley Buzzcut: The square root of the number 9 ! Answer ! Pronto !
Beavis: Um ... _ 60 _ ?
Butt-head: Uh ... 90210 ?
Beavis: Yeah , um ... LMNOP ?

A:
root
****