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

### Instruction:
Who wrote the episode with production code 2acx12?

### Inputs:
table_name: table, columns: ['# (season #)', 'No. (episode #)', 'Title', 'Directed by', 'Written by', 'Original air date', 'Prod. code']

### Response:
SELECT Written by FROM table WHERE Prod. code = 2ACX12