user: Question: What is the Staffel A that has a Staffel D of Energie Cottbus and a Staffel C of Chemie Leipzig and a Staffel B of 1. FC Union Berlin?
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 "Staffel A" FROM "Table" WHERE "Staffel D" = 'Energie Cottbus' AND "Staffel C" = 'Chemie Leipzig' AND "Staffel B" = '1. FC Union Berlin';