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_15211468_3 (episode_no VARCHAR, presenter VARCHAR)
### Question:
What episode number is presented by Ben Okri ?
### Answer:
SELECT episode_no FROM table_15211468_3 WHERE presenter = "Ben Okri"