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 : Trace of Stones (German: Spur der Steine) is a 1966 East German film by Frank Beyer. 
Answer : Spur der Steine

Answer: The Trace of Stones is based upon what?


Question: Context : Nikola Kalabić (until the start of World War II) worked in Land-registry management in Valjevo. 
Answer : World War II

Answer: In what war was Nikola Kalabić a combatant?


Question: Context : HD 156091 is a double star in the southern constellation of Ara. 
Answer : Ara

Answer:
In which constellation is HD 156091?