user: Question: Name the frequency mhz for ERP W of 850 watts
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'FCC info']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['K280EF', '88.9 FM', 'Austin, Minnesota', '9 watts', 'FCC']
SQL:

assistant: SELECT "Frequency MHz" FROM "Table" WHERE "ERP W" = '850 watts';