Who was the opponent with the record of 15-21-6?
CREATE TABLE table_name_23 (opponent VARCHAR, record VARCHAR)
SELECT opponent FROM table_name_23 WHERE record = "15-21-6"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_23 (opponent VARCHAR, record VARCHAR) Question: Who was the opponent with the record of 15-21-6? [/INST] SELECT opponent FROM table_name_23 WHERE record = "15-21-6" </s>