user: Question: Which call sign, broadcast at less than 103.5MHz, has an ERP W of 50?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['W244BG', 96.7, 'Lanesborough, Massachusetts', 1.0, 'D', 'FCC']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "ERP W" = 50.0 AND "Frequency MHz" < 103.5;