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 : The series follows adventures of Dipper Pines (voiced by Jason Ritter) and his twin sister Mabel (voiced by Kristen Schaal) in the fictional town of Gravity Falls, Oregon, while on summer vacation. 
Answer : Oregon

A: Which place does Gravity Falls exist in?
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Q: Context : Antonio Machín (Antonio Abad Lugo Machín; 11 February 1903, in Sagua la Grande, Cuba -- 4 August 1977, in Madrid) was a Cuban singer and musician. 
Answer : 4 August 1977

A: The year Antonio Machín died was what?
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Q: Context : Reinhard Graubner (2 August 1915 -- 3 November 1986) was a highly decorated Major in the Luftwaffe during World War II, and a recipient of the Knight's Cross of the Iron Cross. 
Answer : World War II

A:
Which conflict was Reinhard Graubner a part of?
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