Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_21 (season VARCHAR, staffel_e VARCHAR)
### Question:
Which season has a Staffel E of Stahl Riesa?
### Answer:
SELECT season FROM table_name_21 WHERE staffel_e = "stahl riesa"