This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: West demonstrated an affinity for the arts at an early age; he began writing poetry when he was five years old. His mother recalled that she first took notice of West's passion for drawing and music when he was in the third grade. Growing up in the city,[which?] West became deeply involved in its hip hop scene. He started rapping in the third grade and began making musical compositions in the seventh grade, eventually selling them to other artists. At age thirteen, West wrote a rap song called "Green Eggs and Ham" and began to persuade his mother to pay $25 an hour for time in a recording studio. It was a small, crude basement studio where a microphone hung from the ceiling by a wire clothes hanger. Although this wasn't what West's mother wanted, she nonetheless supported him. West crossed paths with producer/DJ No I.D., with whom he quickly formed a close friendship. No I.D. soon became West's mentor, and it was from him that West learned how to sample and program beats after he received his first sampler at age 15. Question: What was the name of the song he wrote at age thirteen?
Green Eggs and Ham