Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the callsign that has a station type of relay and a channel number of TV-2?

### Inputs:
table_name: table, columns: ['Branding', 'Callsign', 'Ch. #', 'Power kW', 'Station Type', 'Location (Transmitter site)']

### Response:
SELECT Callsign FROM table WHERE Station Type = Relay AND Ch. # = TV-2