question: What nationality is the director of film Operation Stadium?
context: [["Peter Levin", ["Peter Levin is an American director of film, television and theatre."]], ["Operation Stadium", ["Operation Stadium (\"Akcija stadion\") is a Croatian film directed by Du\u0161an Vukoti\u0107.", "It was released in 1977."]], ["Dana Blankstein", ["Dana Blankstein- Cohen( born March 3, 1981) is the director of the Israeli Academy of Film and Television.", "She is a film director, and an Israeli culture entrepreneur."]], ["John Donatich", ["John Donatich is the Director of Yale University Press."]], ["Michael Govan", ["Michael Govan( born 1963) is the director of the Los Angeles County Museum of Art since 2006.", "Prior to this, Govan worked as the director of the Dia Art Foundation in New York City."]], ["Du\u0161an Vukoti\u0107", ["Du\u0161an Vukoti\u0107 (7 February 1927 \u2013 8 July 1998) was a Yugoslav and Croatian cartoonist, author and director of animated films of Montenegrin descent.", "He is the best known member of the Zagreb school of animated films."]], ["John Farrell (businessman)", ["John Farrell is the director of YouTube in Latin America."]], ["Ian Barry (director)", ["Ian Barry is an Australian director of film and TV."]], ["Judah Sandhy", ["Judah Sandhy is an Indian film music director who works in Kannada and Telugu films.", "He rose to fame with 2017 Blockbuster film\" Operation Alamelamma\"."]], ["Derry Quinn", ["Derry Quinn( 1918\u20131987) was an English film and television screenwriter and novelist.", "His most famous work is as a co-author of the screenplay for the MGM's film\" Operation Crossbow\"."]]]
supporting_facts: [["Operation Stadium", 0], ["Du\u0161an Vukoti\u0107", 0]]
evidences: [["Operation Stadium", "director", "Du\u0161an Vukoti\u0107"], ["Du\u0161an Vukoti\u0107", "country of citizenship", "Yugoslav"]]
answer: Yugoslav