Detailed Instructions: 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.
Q: Professor River Song:  You 're doing a very good job acting like you do n't know me . I 'm assuming there 's a reason .
The Doctor: Well , a fairly good _ one _ , actually .
Professor River Song: OK , shall we do diaries then ? Where are we this time ? Ah , going by your face , I 'd say it 's early days for you , yeah ? So , um - crash of the Byzantium . Have we done that yet ?
Professor River Song: Obviously
Professor River Song: ringing no bells . Right , um - oh , picnic at Asgard . Have we done Asgard yet ?
Professor River Song: Obviously
Professor River Song: not . Blimey , very early days , then . Hoo ! Life with a time traveler - never knew it could be * such * hard work . Um ...
Professor River Song: Look
Professor River Song: at you .
Professor River Song: You 're * young*.
The Doctor: I 'm really not , you know .
Professor River Song: No , but you * are*.
Professor River Song: Your eyes . You 're younger than I 've ever seen you .
The Doctor: You 've ... seen me before then ?
Professor River Song: Doctor
Professor River Song: . Please tell me you know who I am .
The Doctor: Who are you ?
A:
REFERENCE reason