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: Dr. Joan Watson:  Well , the good news is that this place is pretty secure , but if you 're gon na be here for a few days , we 're gon na have to get you some food .
Mycroft Holmes: " He has no ambition and no energy . He will not even go out of his way to verify his own solutions . He would rather be considered wrong than go to the trouble of proving himself right . " Something I overheard Sherlock say to my father once . He was _ fifteen _ .
Dr. Joan Watson: I ca n't even picture him at fifteen .
Mycroft Holmes: It hurt , to be ... assessed like that .
Dr. Joan Watson: He knows a lot . He does n't know everything .
Mycroft Holmes: I could have followed father into business . I could have ... followed Sherlock into his ... passions , but I ... wanted ... this , I suppose .
Dr. Joan Watson: You are a success . You own restaurants all over Europe . And the things that you 've done for your country ...
Mycroft Holmes: Folly . Obviously . I should have said no when the agency approached me . But I remembered what Sherlock said , and I remembered my father failing to disagree . And I ... I thought ... I could prove , at least to myself , that I was ... more than what they thought . Idiocy .
A:
AGE