user: Question: Name the rank world for 7 rank subcontinent
Columns: ['Rank Subcontinent', 'Rank Asia', 'Rank World', 'Country', '2011 GDP (PPP) billions of USD']
Types: ['real', 'real', 'real', 'text', 'text']
Sample row: [1.0, 2.0, 3.0, 'India', '$4,469.763']
SQL:

assistant: SELECT "Rank World" FROM "Table" WHERE "Rank Subcontinent" = 7.0;