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: Leonard Hofstadter:  Cats , Sheldon . You 're clearly upset about Amy being gone , and you 're trying to replace her with a bunch of cats .
Sheldon Cooper: Clowder .
Leonard Hofstadter: What ?
Sheldon Cooper: A group of cats is a clowder . Or a glaring .
Leonard Hofstadter: Okay , yeah , fine .
Sheldon Cooper: It 's the kind of thing you ought to know now that we have _ one _ .

group