Instructions: In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.
Input: The Wizard of Oz is a 1939 American musical fantasy film produced by Metro-Goldwyn-Mayer. Widely considered to be one of the greatest films in American history, it is the best-known and most commercially successful adaptation of L. Frank Baum's 1900 children's book, "The Wonderful Wizard of Oz." It stars Judy Garland as Dorothy Gale, alongside Ray Bolger, Jack Haley, Bert Lahr, Frank Morgan, Billie Burke and Margaret Hamilton, with Charley Grapewin, Pat Walshe and Clara Blandick, Terry (billed as Toto), and the Singer Midgets as the Munchkins. Question: So Long, Scarecrow is titled in reference to which 1939 musical fantasy film? Answer: The Wizard of Oz
Output:
The Wizard of Oz is a 1939 American musical fantasy film produced by MetroGoldwynMayer.