Please answer the following question: Harvard Extension School -  Harvard University Extension School in Cambridge Massachusetts is one of the twelve degree-granting schools of Harvard University offering professional certificates and liberal arts-based undergraduate and graduate degree programs aimed at nontraditional students as well as open-enrollment continuing education courses in 60 fields. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Answer:
Educational Institution