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 (release_date VARCHAR, production_num VARCHAR, characters VARCHAR)
### Question:
When was the film released that a less than 5038 production number and was of the character Bosko?
### Answer:
SELECT release_date FROM table_name_21 WHERE production_num < 5038 AND characters = "bosko"