user: Question: what's the dbeingtribution with rsbac being Unknown
Columns: ['Distribution', 'Compile time buffer checks', 'Mandatory access control', 'Software executable space protection', 'grsecurity', 'RSBAC']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Alpine Linux', 'Unknown', 'Unknown', 'PaX', 'Yes', 'Unknown']
SQL:

assistant: SELECT "Distribution" FROM "Table" WHERE "RSBAC" = 'Unknown';