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: His debut at the Metropolitan Opera was in the title role of Lohengrin on January 1, 1890, and he also sang Loge, Siegmund, the title role of Tannhauser, Tristan in Tristan und Isolde, and Siegfried in both Siegfried and Gotterdammerung at the Met. Link Information: none Question: Which of the operas that Vogl played at the Met had the longest run?
Answer: none