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'.

[EX Q]: Context: She appeared as Brangäne in Wagner's Tristan und Isolde, as Fricka in his Die Walküre, as Ortrud in his Lohengrin, Link Information: t was composed between 1857 and 1859  Question: Which of Wagner's operas that Cavelti starred in was written first?
[EX A]: Answer:  Lohengrin,

[EX Q]: Context: During those two years Warner also played two games against John Heisman, another future coaching legend. Heisman was the head coach at Auburn University, and they faced each other in the Link Information: Heisman coached football at Auburn from 1895 to 1899.  Question: How long was Heisman head coach at Auburn?
[EX A]: Answer: 4

[EX Q]: Context: In the episode, Bart and Lisa sneak into the sushi bar's karaoke room and sing the theme song to the 1971 film Shaft, "Theme from Shaft". Link Information: the staff dug up footage from an old Academy Awards ceremony at which the song was performed by Isaac Hayes. Question: What year was the song Shaft performed at the Academy Awards?
[EX A]:
Answer: 1972