Ironwood State Prison - Ironwood State Prison (ISP) is a state prison located south of Interstate 10 in a detached section of Blythe California that lies west of the main portion of the city. It is located in eastern Riverside County California adjacent to Chuckawalla Valley State Prison. 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:
Building