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: King Tut:  Curse you , Batman . May you fall down a flight of stairs and break every tooth in your head except _ one _ and in that may you have a toothache for the rest of your life which wo n't be very long .

tooth