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_25721_4 (release VARCHAR, _number_of_discs VARCHAR)
### Question:
Which release had 6 DVDs?
### Answer:
SELECT release FROM table_25721_4 WHERE _number_of_discs = 6