user: Question: The Zeehond was built by whom?
Columns: ['Ship', 'Builder', 'Laid down', 'Launched', 'Commissioned']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Dolfijn', 'Rotterdamse Droogdok Mij', '30 December 1954', '20 May 1959', '16 December 1960']
SQL:

assistant: SELECT "Builder" FROM "Table" WHERE "Ship" = 'Zeehond';