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: The Doctor:  It 's the oldest story in the universe . This _ one _ or any other . Boy and girl fall in love , get separated by events - war , politics , accidents in time . She 's thrown out of the hex or he 's thrown into it . Since then they 've been yearning for each other across time and space . Across dimensions . This is n't a ghost story , it 's a love story .

universe