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_18424435_4 (directed_by VARCHAR, production_code VARCHAR)
### Question:
Who directed the episode with a production code of 301?
### Answer:
SELECT directed_by FROM table_18424435_4 WHERE production_code = 301