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: Ben Jackson:  You know , it 's little things like this that make it difficult to believe that you 're the Doctor .
The Doctor: Ahh .
Ben Jackson: The other _ one _ , I mean . The proper one . Oh nuts , you know what I mean .
The Doctor: Nuts ? Yes , certainly , here we are . Crackers ?
Ben Jackson: You , my old china , are an out and out phoney !
The Doctor: China , yes , I went there once I believe . Met Marco Polo !
Ben Jackson: No , not China . China ! China and plate , mate , friend .
The Doctor: Yes , Marco Polo a friend ? I believe he was .
Polly Wright: Do n't listen to him , Doctor . I know who you are .

Doctor