user: Question: What was the class for Appleton, Wisconsin?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['W254AG', 98.7, 'Escanaba, Michigan', 27.0, 'D', 'FCC']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "City of license" = 'Appleton, Wisconsin';