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: Ernest Pratt:  What the heck is that ?
Janos Bartok: Ball lightening .
Huitzilopochtli Ramos: Actually , Aristotle called them fire balls .
Janos Bartok: Thought of by many renounced men of science to be an optical illusion .
Ernest Pratt: Darn good _ one _ , if you ask me .
Janos Bartok: Yeah , I thought it was an optical illusion myself until I saw one appear accidentally by the tower . I determined that it was a resonance of the electromagnetic field . And what you are seeing , for the very first time in the history of man , is ball lightening created artificially .
Ernest Pratt: What can you do with it ?
Janos Bartok: I have no idea . It could change the course of human events . Possibly not . Right now it 's delightfully useless ; and we shall follows this useless research where ever it shall take us !

REFERENCE illusion