user: Question: What is the call sign for 90.9 FM which is in Florida?
Columns: ['Call sign', 'Frequency', 'City of license', 'State', 'FCC info']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['WMBV', '91.9 FM', 'Dixons Mills', 'Alabama', 'FCC']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "State" = 'Florida' AND "Frequency" = '90.9 FM';