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

### Instruction:
what is the minimum production code with title "foreign exchange problem / turn about"

### Inputs:
table_name: table, columns: ['Episode #', 'Production code', 'Title', 'Directed by', 'Written by', 'Airdate']

### Response:
SELECT MIN Production code FROM table WHERE Title = "Foreign Exchange Problem / Turn About"