user: Question: Who were the directors of the film with the original title o.k.?
Columns: ['Year [e ] (Ceremony)', 'Film title used in nomination', 'Original title', 'Director', 'Result']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1956 (29th)', 'The Captain of Köpenick', 'Der Hauptmann von Köpenick', 'Helmut Käutner Category:Articles with hCards', 'Nominee']
SQL:

assistant: SELECT "Director" FROM "Table" WHERE "Original title" = 'o.k.';