Definition: In this task you are given a story and a question regarding that story. You must judge whether the question is answerable based on the info given to you. Label the instances as "Answerable" or "Not Answerable" based on your judgment. the story and the question are separated by a new line character.
Input: Dan had a very fine cobblestone walkway. Some of the stones had started to jut out unevenly. Dan got out a shovel and leveled the dirt under them. He tamped them down gently to make them all match. Now the stones in Dan's walkway are all perfectly even.
Why had Dan a very fine cobblestone walkway?

Answerable