user: Question: What Branding does WRKO calls use?
Columns: ['Calls', 'Frequency', 'Branding', 'Format', 'Market/Rank', 'Timeslot', 'Group owner']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['WGAN', '560 kHz', 'News Radio 560 WGAN', 'News/Talk', 'Portland, Maine /90', 'Live 3P-6P', 'Saga Communications']
SQL:

assistant: SELECT "Branding" FROM "Table" WHERE "Calls" = 'WRKO';