A Number is a 2002 play by English playwright Caryl Churchill which addresses the subject of human cloning and identity especially nature versus nurture. The story set in the near future is structured around the conflict between a father (Salter) and his sons (Bernard 1 Bernard 2 and Michael Black) – two of whom are clones of the first one. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Written Work