original question: How many genres does [The Wizard of Oz] have?
answer: 21
answer type: Netflix Genre.
auxiliary information: The Wizard of Oz is a 1939 American musical fantasy film produced by Metro-Goldwyn-Mayer, and the most well-known and commercially successful adaptation based on the 1900 novel The Wonderful Wizard of Oz by L. Frank Baum. The film stars Judy Garland; Terry the dog, billed as Toto; Ray Bolger, Jack Haley, Bert Lahr, Frank Morgan, Billie Burke, Margaret Hamilton, with Charley Grapewin and Clara Blandick, and the Singer Midgets as the Munchkins, with Pat Walshe as leader of the flying monkeys. Notable for its use of Technicolor, fantasy storytelling, musical score and unusual characters, over the years it has become one of the best-known films and part of American popular culture. It was a box office disappointment on its initial release, earning only $3,017,000 on a $2,777,000 budget, despite receiving largely positive reviews. The film was MGM's most expensive production at that time, and did not recoup much of the studio's investment until subsequent re-releases. It was nominated for six Academy Awards, including Best Picture but lost to Gone with the Wind. It did win in two other categories including Best Original Song for "Over the Rainbow".
What is the number of genres that [The Wizard of Oz] has?