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_2818164_2 (production_code INTEGER, original_air_date VARCHAR)
### Question:
What's the production code of the episode originally aired on February 21, 1985?
### Answer:
SELECT MIN(production_code) FROM table_2818164_2 WHERE original_air_date = "February 21, 1985"