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: Special Agent Seeley Booth:  Hey ! Oh , is that my bureau assessment , you 're filling out ?
Dr. Temperance 'Bones' Brennan: Yes , they want me to , because we 're partners
Dr. Temperance 'Bones' Brennan: Oh
Dr. Temperance 'Bones' Brennan: But you 're not allowed to look at it ! It 's confidential
Special Agent Seeley Booth: What are all those , uh , papers there ?
Dr. Temperance 'Bones' Brennan: This is my answer to question 3a
Special Agent Seeley Booth: 3a ? They only have three little lines for that !
Dr. Temperance 'Bones' Brennan: It says : use additional paper if necessary
Special Agent Seeley Booth: These are at least 15 pieces of paper
Dr. Temperance 'Bones' Brennan: _ 18 _ !
A:
REFERENCE pieces