question: What nationality is the director of film Guns Of Diablo?
context: [["John Donatich", ["John Donatich is the Director of Yale University Press."]], ["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 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."]], ["Peter Levin", ["Peter Levin is an American director of film, television and theatre."]], ["Guns of Diablo", ["Guns of Diablo is a Metrocolor 1965 Western directed by Boris Sagal, starring Charles Bronson, Susan Oliver and Kurt Russell.", "Charles Bronson is a wagon scout (Linc Murdock), who runs into difficulties when he meets old flame Maria (Susan Oliver), now married to corrupt lawman Rance Macklin (Jan Merlin).", "This was actually an expanded version of the last episode of MGM-TV's brief series \"The Travels of", "Jaimie McPheetersThe Day of the Reckoning\"), originally telecast in black and white over ABC on March 15, 1964.", "Russ Conway refilmed Dan O'Herlihy's original scenes as Kurt Russell's father for this adaptation."]], ["Guns of Darkness", ["Guns of Darkness is a 1962 British drama film directed by Anthony Asquith which stars David Niven, Leslie Caron and James Robertson Justice.", "It is based on the novel\" Act of Mercy\" by Francis Clifford( the book was re-entitled\" Guns of Darkness\" in its US publication)."]], ["Boris Sagal", ["Boris Sagal (October 18, 1923 \u2013 May 22, 1981) was a Ukrainian-American television and film director."]], ["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."]], ["Guns of the Law", ["Guns of the Law is a 1944 American film directed by Elmer Clifton."]]]
supporting_facts: [["Guns of Diablo", 0], ["Boris Sagal", 0]]
evidences: [["Guns of Diablo", "director", "Boris Sagal"], ["Boris Sagal", "country of citizenship", "American"]]
answer: American