user: Question: Which Call sign has a Branding of CBC Radio One?
Columns: ['Frequency', 'Call sign', 'Branding', 'Format', 'Owner']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['600 AM', 'CKAT', 'Country 600', 'country / news / sports', 'Rogers Communications']
SQL:

assistant: SELECT "Call sign" FROM "Table" WHERE "Branding" = 'CBC Radio One';