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'.

Context: Anderson was born in Edinburgh in 1832. Link Information: His brother, John Anderson was a zoologist. Question: What age difference was there between Anderson and his brother?
Answer: 1

Context: He was most influenced by Andrew Wyeth and Edward Hopper. Link Information: Andrew Newell Wyeth ( ; July 12, 1917 –  Question: Of the two artists who influenced Jones, which was the eldest?
Answer: Edward Hopper

Context: The estate of Wolfe alleged that Wolfe was entitled to a writing credit for the song "Stairway to Heaven"; Klausner ruled in April 2016 Link Information: none Question: How many albums featuring the song "Stairway to Heaven" had been sold by the time Klausner ruled on writing credit for the song?

Answer: none