user: Question: What is the IHSAA class of Centerville, which plays IHSAA class AA football?
Columns: ['School', 'Location', 'Mascot', 'Size', 'IHSAA Class', 'IHSAA Football Class', 'County']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Cambridge City Lincoln', 'Cambridge City', 'Golden Eagles', 400.0, 'AA', 'A', '89 Wayne']
SQL:

assistant: SELECT "IHSAA Class" FROM "Table" WHERE "IHSAA Football Class" = 'AA' AND "School" = 'Centerville';