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 _. Your answer should be chosen from the given text, and should not contain other words.
Input: Dr Watson:  I wonder what desperate circumstances could occasion such an appeal .
Sherlock Holmes: I have devised seven separate explanations , each of which would cover the facts as far as we know them .
Dr Watson: Oh , and which _ one _ do you favour , Holmes ?
Sherlock Holmes: At the moment , I have no favourites . Data , data , data ! I can not make bricks without clay !

explanations