user: Question: What is the call sign for the frequency of 0 105.7 FM?
Columns: ['Call sign', 'Frequency', 'City of License', 'Owner', 'Format']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['KAER', '0 89.5 FM', 'St. George', 'Educational Media Foundation', 'Contemporary Christian music']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "Frequency" = '0 105.7 FM';