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: Ludwig Von Drake:  One of the most important chapters in my book is the _ one _ on what to do with the kids during summer vacation . Well whatever you do , get them out of the house , go to the mountains , go to the beach , go anywhere , but go ! Or you 're gon na go nuts ! Had I known that Family X was going to be on the go so much , I would've chosen Family Y ! But I was determined to hang on until my research was completed .

chapters