user: Question: What country does Round 4 come from?
Columns: ['Round', 'Player', 'Position', 'Nationality', 'College/Junior/Club Team (League)']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Marc Staal', 'D', 'Canada', 'Sudbury Wolves ( OHL )']
SQL:

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