user: Question: Who is the builder of Pennant D03?
Columns: ['Pennant number', 'Ship', 'Builder', 'Laid down', 'Launched', 'Commissioned']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['D03', 'Icarus †', 'John Brown & Company , Clydebank', '9 March 1936', '26 November 1936', '3 May 1937']
SQL:

assistant: SELECT "Builder" FROM "Table" WHERE "Pennant number" = 'D03';