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: Dayna:  But Servalan told us he was dead .
Avon: And you believed her ?
Dayna: Well , she had no reason to lie .
Avon: She does n't need _ one _ . It comes quite naturally to her , like breathing .

reason