Who wrote the episode that has the production code ad1c05?
CREATE TABLE table_name_4 (written_by VARCHAR, production_code VARCHAR)
SELECT written_by FROM table_name_4 WHERE production_code = "ad1c05"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_4 (written_by VARCHAR, production_code VARCHAR) Question: Who wrote the episode that has the production code ad1c05? [/INST] SELECT written_by FROM table_name_4 WHERE production_code = "ad1c05" </s>