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

### Instruction:
What is the frequency when callsign is dxru-fm?

### Inputs:
table_name: table, columns: ['Branding', 'Callsign', 'Frequency', 'Power kW', 'Coverage']

### Response:
SELECT Frequency FROM table WHERE Callsign = DXRU-FM