user: Question: what's the season with regionalliga nord being VfB Oldenburg
Columns: ['Season', 'Regionalliga Süd', 'Regionalliga West/Südwest', 'Regionalliga Nord', 'Regionalliga Nord-Ost']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1994-95', 'SpVgg Unterhaching', 'Arminia Bielefeld', 'VfB Lübeck', 'Carl Zeiss Jena']
SQL:

assistant: SELECT "Season" FROM "Table" WHERE "Regionalliga Nord" = 'VfB Oldenburg';