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

### Instruction:
where value world rank is 12, what is the quantity world rank?

### Inputs:
table_name: table, columns: ['Rank', 'Commodity', 'Value (Int $1000)', 'Production (MT)', 'Quantity world rank', 'Value world rank']

### Response:
SELECT Quantity world rank FROM table WHERE Value world rank = 12