Please answer the following question: Sea lettuce - The sea lettuces comprise the genus Ulva a group of edible green algae that is widely distributed along the coasts of the world's oceans. The type species within the genus Ulva is Ulva lactuca lactuca being Latin for lettuce. The genus also includes the species previously classified under the genus Enteromorpha the former members of which are known under the common name green nori. 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?
A:
Plant