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

### Instruction:
Name the least world rank for south american rank 3

### Inputs:
table_name: table, columns: ['South American Rank', 'World Rank', 'Nation', '2011 (IMF)', '2008 (CIA Factbook)']

### Response:
SELECT MIN World Rank FROM table WHERE South American Rank = 3