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.
--------
Question: Context : Gelnhausen railway (Hungen--Gieen) was opened on 29 December 1869 and Hungen station went into operation.
Answer : 29 December 1869

Answer: When was Hungen station opened?

Question: Context : ISO 9241 is a multi-part standard from the International Organization for Standardization (ISO) covering ergonomics of human-computer interaction.
Answer : International Organization for Standardization

Answer: Who set the standards for ISO 9241?

Question: Context : Charles Marquette (1845--1907) was a Sergeant in the United States Army and a Medal of Honor recipient for his role in the American Civil War.
Answer : American Civil War

Answer:
What war was Charles Marquette in?