instruction:
In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
question:
Context: Stren was a counsellor for industrialist Sam Eyde, the founder and first mangager of Norsk Hydro, Link Information: the company was founded on December 2, 1905 Question: In what year did the industrialist that Stren worked for found the company that he also managed?
answer:
Answer: 1905

question:
Context: Civil War Unknowns Monument Link Information: The Civil War Unknowns Monument, which was located south-southwest of Arlington House, was covered by a canopy. Question: In what year was the Civil War Unknowns Monument built?
answer:
Answer: 1865

question:
Context: the group originally included lead vocalist Keith Relf Link Information: The Yardbirds are an English blues rock band from London. Formed in May 1963, the group originally included lead vocalist Keith Relf Question: Which person was the lead singer of the Yardbirds the longest?
answer:
Answer: Robert Plant