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: Emily Prentiss:  The storytelling 's in the details . These wires mean something .
Detective William LaMontagne Jr.: Like what ?
Emily Prentiss: The colors of the flag of Chad . Red , yellow , and blue . Only _ one _ is different from the US flag , yellow .
Detective William LaMontagne Jr.: What do you think ? How did you do that ?
Emily Prentiss: I did n't overthink it .

colors