user: Question: Which Call sign has an ERP W of 75?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'Facility ID', 'ERP W', 'Height m ( ft )', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['KZTH', 88.5, 'Piedmont, Oklahoma', 83880.0, 50000.0, 'm (ft)', 'C1', 'FCC']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "ERP W" = 75.0;