user: Question: Who sunk the ship with the flag of Norway?
Columns: ['Date', 'Name', 'Flag', 'Tonnage (GRT)', 'Sunk by']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['16 March 1943', 'Elin K', 'Norway', 5214.0, 'U-603']
SQL:

assistant: SELECT "Sunk by" FROM "Table" WHERE "Flag" = 'Norway';