Question: Which country the director of film Opera Ball (1939 Film) is from?
Sentence (from "Géza von Bolváry"): Géza von Bolváry (full name Géza Maria von Bolváry-Zahn; 26 December 1897 – 10 August 1961) was a Hungarian actor, screenwriter and film director, who worked principally in Germany and Austria.
Relevant evidence: Yes