user: Question: Which nationality has rank 4?
Columns: ['Rank', 'Lane', 'Name', 'Nationality', 'Time']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 4.0, 'Ryan Lochte', 'United States', '1:57.69']
SQL:

assistant: SELECT "Nationality" FROM "Table" WHERE "Rank" = 4.0;