user: Question: What is the call sign of 1200 AM?
Columns: ['Frequency', 'Call sign', 'Name', 'Format', 'Owner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['740 AM', 'KVOX', '740 The Fan ( Fox Sports Radio )', 'Sports', 'Radio Fargo-Moorhead']
SQL:

assistant: SELECT COUNT("Call sign") FROM "Table" WHERE "Frequency" = '1200 AM';