user: Question: What country was the game played when it was played from April 11-April 21?
Columns: ['Date', 'Location', 'Country', 'Event', 'Winner', 'Runner-up']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['February 28-March 12', 'Gold Coast', 'Australia', 'Quiksilver Pro', 'Kelly Slater ( USA )', 'Taj Burrow ( AUS )']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Date" = 'April 11-April 21';