user: Question: What class of car had the XI Coppa Acerbo title?
Columns: ['Year', 'Driver/s', 'Class', 'Vehicle', 'Race title']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1961', 'Lorenzo Bandini Giorgio Scarlatti', 'Sports car', 'Ferrari 250TRI', '1961 4h Testa Rosa']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Race title" = 'XI Coppa Acerbo';