Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_25459168_2 (circuit VARCHAR, date VARCHAR)

### Question ###
What circuit was used on August 21?

### Accurate SQL ###

SELECT circuit FROM table_25459168_2 WHERE date = "August 21"