Generate a correct and concise answer for the question based on the words in the context.

Example Input: Context : Samuel Harriman (October 1826 -- August 25, 1897) was a colonel in the Union Army during the American Civil War who was nominated and confirmed for appointment to the grade of brevet brigadier general in 1866. 
Question : Which war did Samuel Harriman serve in?
Example Output: American Civil War

Example Input: Context : Tuor remained in Gondolin, and wed Turgon's daughter, Idril Celebrindal. 
Question : What is Tuor's spouse's name?
Example Output: Idril

Example Input: Context : Marble Arch is a 19th-century white marble faced triumphal arch and London landmark. 
Question : What material was used for Marble Arch?
Example Output:
marble