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: Martha Jones:  Doctor , it 's the Professor . He 's got this watch , this fob watch that 's the same as yours . Same writing , same everything .
The Doctor: Do n't be ridiculous .
Martha Jones: I asked him , he said he 's had it his whole life .
Captain Jack Harkness: So , he 's got the same watch .
Martha Jones: But it 's not a watch , it 's a thing , a chameleon thing .
The Doctor: No , no , no , it 's this thing , this device , it re - writes biology . Changes a Time Lord into a human .
Martha Jones: And it 's the same watch !
The Doctor: It ca n't be .
Captain Jack Harkness: That means he could be a Time Lord . You may not be the last _ one _ .

Lord