user: Question: What is the weight of the entry that has a date of birth of 1981-11-21?
Columns: ['Name', 'Pos.', 'Height', 'Weight', 'Date of Birth', 'Club']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Stefano Tempesti', 'GK', 'm (ft 8in)', 'kg (lb)', '1979-06-09', 'Pro Recco']
SQL:

assistant: SELECT "Weight" FROM "Table" WHERE "Date of Birth" = '1981-11-21';