Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Season | Staffel A | Staffel B | Staffel C | Staffel D | Staffel E |
| --- | --- | --- | --- | --- | --- |
| 1971-72 | TSG Wismar | Dynamo Berlin II | Chemie Leipzig | Motor Werdau | Rot-Weiß Erfurt |
| 1972-73 | Vorwärts Stralsund | Dynamo Berlin II * | Vorwärts Leipzig | Dynamo Dresden II * | Chemie Zeitz |
| 1973-74 | Vorwärts Stralsund | 1. FC Union Berlin | Hallescher FC Chemie | Chemie Böhlen | Wismut Gera |
| 1974-75 | Dynamo Schwerin | 1. FC Union Berlin | Chemie Leipzig | Energie Cottbus | Wismut Gera |
| 1975-76 | Hansa Rostock | 1. FC Union Berlin | Hallescher FC Chemie II | Motor Werdau | FC Carl Zeiss Jena II |
| 1976-77 | Vorwärts Stralsund | Stahl Hennigsdorf | Chemie Leipzig | Chemie Böhlen | Wismut Gera |
| 1977-78 | Hansa Rostock | Vorwärts Neubrandenburg | Chemie Leipzig | Lok Dresden | Stahl Riesa |
| 1978-79 | TSG Bau Rostock | Vorwärts Frankfurt | Chemie Leipzig | Energie Cottbus | Motor Suhl |
| 1979-80 | Hansa Rostock | Dynamo Fürstenwalde | Chemie Böhlen | Energie Cottbus | Wismut Gera |
| 1980-81 | Schiffahrt/Hafen Rostock | 1. FC Union Berlin | Chemie Schkopau | Energie Cottbus | Motor Suhl |
| 1981-82 | Vorwärts Stralsund | 1. FC Union Berlin | Chemie Böhlen | Stahl Riesa | Motor Nordhausen |
| 1982-83 | Schiffahrt/Hafen Rostock | Stahl Brandenburg | Chemie Leipzig | Stahl Riesa | Wismut Gera |
| 1983-84 | Vorwärts Neubrandenburg | Stahl Brandenburg | Vorwärts Dessau | Sachsenring Zwickau | Motor Suhl |
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?
Answer:
Dynamo Schwerin