user: Question: What is the Call sign of the Frequency 106.9 The X?
Columns: ['Frequency', 'Call sign', 'Branding', 'Format', 'Owner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['AM 980', 'CFPL', 'AM980', 'news/talk', 'Corus Entertainment']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "Branding" = '106.9 The X';