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.
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Question: Context : Prince Caspian (originally published as Prince Caspian: The Return to Narnia) is a high fantasy novel for children by C. S. Lewis, published by Geoffrey Bles in 1951. 
Answer : Narnia

Answer: Which place does Prince Caspian exist in?


Question: Context : Aarne Arvonen was born in Helsinki and was the last surviving veteran of the Finnish Civil War of 1918 having served for the Red Guard. 
Answer : Finnish Civil War

Answer: What was the war that Aarne Arvonen fought in?


Question: Context : Káťa Kabanová (also known in various spellings including Katia, Katja, Katya, and Kabanowa) is an opera in three acts, with music by Leoš Janáček to a libretto by Vincenc Červinka, based on The Storm, a play by Alexander Ostrovsky. 
Answer : The Storm

Answer:
The Káťa Kabanová is based upon what?