Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. HM Prison Pentridge -  HM Prison Pentridge was an Australian prison built in 1850 in Coburg Victoria. The first prisoners arrived in 1851. The prison officially closed on 1 May 1997.Pentridge was often known by the nickname The Bluestone College Coburg College or the College of Knowledge. The grounds were originally landscaped by renowned landscape gardener Hugh Linaker. Since decommissioning the prison has been partly demolished to make way for a housing development.
The answer to this question is:
Building