user: Question: Class of D, anD a Frequency MHz smaller than 107.7, anD a ERP W smaller than 232 has what call sign?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['KJRL', 105.7, 'Herington, Kansas', 12500.0, 'C3', 'FCC']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "Class" = 'D' AND "Frequency MHz" < 107.7 AND "ERP W" < 232.0;