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

### Instruction:
What is the air date for the episode with production code ad1c13?

### Inputs:
table_name: table, columns: ['Title', 'Directed by', 'Written by', 'Original air date', 'Production code']

### Response:
SELECT Original air date FROM table WHERE Production code = ad1c13