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 : Charles Calvin Rogers (September 6, 1929 -- September 21, 1990) was a United States Army officer and a recipient of America's highest military decoration--the Medal of Honor--for his actions in the Vietnam War. 
Answer : Vietnam War

Answer: In which war did Charles Calvin Rogers fought?


Question: Context : ``The Next Witness'' is a Nero Wolfe mystery novella by Rex Stout, first published as ``The Last Witness'' in the May 1955 issue of The American Magazine. 
Answer : Nero Wolfe

Answer: The The Next Witness has what character?


Question: Context : Power Rangers Lost Galaxy is an American television series and the seventh season of the Power Rangers franchise, based on the Super Sentai series Seijuu Sentai Gingaman. 
Answer : Seijuu Sentai Gingaman

Answer:
The Power Rangers Lost Galaxy is based upon what?