user: Question: What label has CD single as the format?
Columns: ['Date', 'Label', 'Region', 'Format', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['4 April 1988', 'Polydor', 'France, Belgium, Switzerland', '7" single', '887 448-7']
SQL:

assistant: SELECT "Label" FROM "Table" WHERE "Format" = 'CD single';