user: Question: Name the original title directed by Luis Buñuel
Columns: ['Country', 'Film title used in nomination', 'Language', 'Original title', 'Director']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Belgium', 'The Lonely Killers', 'French', 'Les tueurs fous', 'Boris Szulzinger']
SQL:

assistant: SELECT "Original title" FROM "Table" WHERE "Director" = 'Luis Buñuel';