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: David Rossi:  The odds of this event striking the same family on the same day must be a _ billion _ to one .
Dr. Spencer Reid: Close enough .

odds