user: Question: Which Nationality has a Round of 4?
Columns: ['Round', 'Player', 'Position', 'Nationality', 'College/junior/club team (league)']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2.0, 'Danny Kristo', 'Right Wing', 'United States', 'USA U-18']
SQL:

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