user: Question: Which season has a Staffel E of Stahl Riesa?
Columns: ['Season', 'Staffel A', 'Staffel B', 'Staffel C', 'Staffel D', 'Staffel E']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1971-72', 'TSG Wismar', 'Dynamo Berlin II', 'Chemie Leipzig', 'Motor Werdau', 'Rot-Weiß Erfurt']
SQL:

assistant: SELECT "Season" FROM "Table" WHERE "Staffel E" = 'Stahl Riesa';