What was the production code of the episode written by Anthony Sparks?
CREATE TABLE table_25851971_1 (production_code VARCHAR, written_by VARCHAR)
SELECT production_code FROM table_25851971_1 WHERE written_by = "Anthony Sparks"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_25851971_1 (production_code VARCHAR, written_by VARCHAR) Question: What was the production code of the episode written by Anthony Sparks? [/INST] SELECT production_code FROM table_25851971_1 WHERE written_by = "Anthony Sparks" </s>