Please answer the following question: Port Phillip Prison - Port Phillip Prison is a maximum security prison located at Truganina Victoria Australia. It is Victoria's largest prison able to accommodate up to 824 prisoners. The prison is privately operated on behalf of the Government of Victoria by G4S Australia Pty Ltd. 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