user: Question: Name the least world rank for south american rank 3
Columns: ['South American Rank', 'World Rank', 'Nation', '2011 (IMF)', '2008 (CIA Factbook)']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 51.0, 'Argentina', '$17,376', '$14,500']
SQL:

assistant: SELECT MIN("World Rank") FROM "Table" WHERE "South American Rank" = 3.0;