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

### Instruction:
What is the title of the episode directed by Christopher Petry with the production cod 3x6006?

### Inputs:
table_name: table, columns: ['No.', '#', 'Title', 'Directed by', 'Written by', 'U.S. air date', 'Production code', 'U.S. viewers (million)']

### Response:
SELECT Title FROM table WHERE Directed by = Christopher Petry AND Production code = 3X6006