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_12226390_2 (directed_by VARCHAR, production_code VARCHAR)
### Question:
Who directed the episode with production code 28?
### Answer:
SELECT directed_by FROM table_12226390_2 WHERE production_code = 28