Definition: 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'.
Input: 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?
Output:
Answer: none