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_31 ( class VARCHAR, race_title VARCHAR )

### Question ###
What class of car had the XI Coppa Acerbo title?

### Accurate SQL ###

SELECT class FROM table_name_31 WHERE race_title = "xi coppa acerbo"