user: Question: What was the callsign in Zamboanga?
Columns: ['Branding', 'Callsign', 'Frequency', 'Power (kW)', 'Location']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Sonshine Radio*', 'DZAR', '1026kHz', '50kW', 'Metro Manila']
SQL:

assistant: SELECT "Callsign" FROM "Table" WHERE "Location" = 'Zamboanga';