Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Q: Context : William George Bock (born June 11, 1884 in Port Elgin, Ontario, Canada-died 1973) was a Canadian politician and farmer. 
Answer : 1973

A: What year did William George Bock die?
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Q: Context : Maschenka (Russian: Машенька, Mashen'ka; English: Mary) is a 1987 British film adaptation of the debut novel by Vladimir Nabokov, first published under his pen name V. Sirin in 1926. 
Answer : Mary

A: The Maschenka is based upon what?
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Q: Context : Song of the South is a 1946 American live-action/animated musical film produced by Walt Disney and released by RKO Radio Pictures, based on the Uncle Remus stories collected by Joel Chandler Harris. 
Answer : Uncle Remus

A:
Which is the basis of Song of the South?
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