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: Nurse:  I have good news , gentlemen . Both of your blood types are compatible with Mr. Lewis for his kidney transplant .
Jeff Greene: Goodnight , nurse ...
Nurse: Goodnight .
Jeff Greene: It 's just a saying .
Nurse: I never heard of it .
Jeff Greene: It 's an old _ one _ .
Nurse: That 's nice .
Jeff Greene: It is .
Nurse: I know it is .
Jeff Greene: Do you ?
Nurse: Do * you * ?
Jeff Greene: I do .
Nurse: Good for you .
Jeff Greene: It is good for me .
Nurse: Oh , you think so ?
Jeff Greene: I know so .
Nurse: I 'm glad .
Jeff Greene: So am I.
Nurse: That makes two of us .
Jeff Greene: So you say .
Nurse: So I did .

saying