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_name_28 ( test_standard VARCHAR, usage VARCHAR, class VARCHAR )

### Question ###
Which Test Standard has a Usage of secondary filters, and a Class of f5? Question 4

### Accurate SQL ###

SELECT test_standard FROM table_name_28 WHERE usage = "secondary filters" AND class = "f5"