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: The broadnose sevengill shark (Notorynchus cepedianus) is known to prey on the crossback stingaree Link Information: It is recognizable because of its seven gill slits, while most shark species have five gill slits Question: What is the difference between the amount of gills the species known to prey on the crossback stingaree have compared to most shark species?
Answer: 2

Context: In 2000 Liao made his debut at the Washington National Opera Link Information: In 2000 Liao made his debut at the Washington National Opera Question: How long had the Kennedy Center been standing by the year Liao made his debut at the Washington National Opera?
Answer: 29

Context: He has done art commission work for Spin Magazine Link Information: owned by the Billboard-Hollywood Reporter Media Group division of Valence Media. Question: What organization owns Spin Magazine?
Answer: Valence Media