user: Question: What format was released April 16, 2009?
Columns: ['Region', 'Date', 'Format', 'Label', 'Edition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['United States', 'September 23, 2008', 'CD , digital download', 'Hollywood Records', 'Standard']
SQL:

assistant: SELECT "Format" FROM "Table" WHERE "Date" = 'April 16, 2009';