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'.

[Q]: Context: She appeared as Brangane in Wagner's Tristan und Isolde, as Fricka in his Die Walkure, 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?
[A]: Answer: Lohengrin,

[Q]: Context: An excited Bart comes home from school and shows Homer and Marge his delayed entry program form. Link Information: he is voiced by Julie Kavner and first appeared on television in The Tracey Ullman Show short "Good Night" on April 19, 1987 Question: Who are the voice actors who play the roles of Homer and Marge?
[A]: Answer: Julie Kavner

[Q]: Context: The inner bay was defined by two close pairs of interplane struts, which between them supported the push-pull pairs of Le Rhone 9C nine cylinder rotary engines Link Information: Lawrence Hargrave first developed a rotary engine in 1889 using compressed air, intending to use it in powered flight. Question: When was the engine invented?
[A]:
Answer: 1889