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 _. There are several possible answers, you'll need to choose the proper one. Carefully read the given text, pay special attention to the marked number, think about what (unwritten) information the marked number holds inside, choose the most adequate word(s) from the optional answers. If none of them seems right to you, there's also an option for other. If your answer is "REFERENCE", also write the reference entity, otherwise write the implicit option name. Options to choose from are:
REFERENCE: Some object which is being mentioned in the text before or after the target number. The reference answer has a higher priority than any other. If both Reference and another answer are possible, prioritize the Reference.
YEAR: Describing a calendric year
AGE: Describing someone's age
CURRENCY: Reference to some monetary value e.g dollar, euro etc.
PEOPLE: Describing a single/plural persons
TIME: Describing a time of the day. Usually you can add the word o'clock after those numbers.
OTHER: Some other option, which isn't listed here.
Input: The Doctor:  Oh ! I 'm on your side , remember ? Hey , why did n't you wake me ? I should have been on watch half an hour ago .
Victoria: I thought you should rest .
The Doctor: Why me ?
Victoria: No reason , really .
The Doctor: Oh , I think I know . Is it because I 'm ...
Victoria: Well , if you are four hundred and fifty years old , you need a great deal of sleep .
The Doctor: Well , that 's very considerate of you , Victoria . But , between you and me , I 'm really quite lively actually - all things being considered . Are you happy with us , Victoria ?
Victoria: Yes , I am . At least , I would be if my father were here .
The Doctor: Yes , I know , I know .
Victoria: I wonder what he would have thought if he could see me now .
The Doctor: You miss him very much , do n't you ?
Victoria: It 's only when I close my eyes . I can still see him standing there . Before those horrible Dalek creatures came to the house . He was a very kind man . I shall never forget him . Never .
The Doctor: No , of course you wo n't . But , you know , the memory of him wo n't always be a sad _ one _ .
Victoria: I think it will . You ca n't understand , being so ancient .
The Doctor: Eh ?
Victoria: I mean old .
The Doctor: Oh .
Victoria: You probably ca n't remember your family .
The Doctor: Oh , yes , I can , when I want to , and that 's the point really .

REFERENCE memory