Brad Just Graduated from the Corrections Academy in His State

Brad just graduated from the corrections academy in his state. He has been assigned to a maximum security prison that houses all types of offenders. He is shadowing a veteran correctional officer named Carl.
-Brad overheard inmates using terms he was not familiar with. He asks Carl what the inmates mean when they are talking about "pruno." Carl informs Brad the inmates are speaking of:

A) food stolen from the kitchen
B) prison-distilled wine made from fruit and other ingredients
C) old inmates who are missing their teeth
D) illegal drugs that have entered the facility