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 : The Doorbell Rang is a Nero Wolfe detective novel by Rex Stout, first published by the Viking Press in 1965.
Answer : Nero Wolfe

Answer: What series is The Doorbell Rang 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 : Walter Grabmann (20 September 1905 -- 20 August 1992) was a German World War II Luftwaffe Generalmajor.
Answer : Luftwaffe

Answer:
Which military did Walter Grabmann serve with?