Given the task definition and input, reply with output. In this task, you're given a passage, 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'.

Passage: Sheridan had her early vocal training while at school at the Dominican Convent in Eccles Street, Dublin, with additional lessons from Vincent O'Brien. In 1908, she won a gold medal at the Feis Ceoil. From 1909 to 1911 she studied at the Royal Academy of Music in London, during which time she was introduced to the Italian inventor Guglielmo Marconi, who was instrumental in arranging further studies for her in opera in Rome. With Marconi's help she auditioned in 1916 for Alfredo Martino, a prominent singing teacher attached to the Teatro Costanzi, and she made her debut there in January 1918 in Puccini's La Boheme. In July 1919 she appeared at the Royal Opera House (Covent Garden) in the title role in Iris by Pietro Mascagni. Sheridan returned to Italy, where her career continued to grow, with performances at the Teatro Dal Verme in Milan and at the Teatro San Carlo in Naples, primarily in Puccini roles. In 1922 she first sang at La Scala, Milan, in La Wally by Catalani under the direction of Toscanini. For the next few years she would sing at La Scala with great success. Perhaps her greatest role was Madama Butterfly, which she sang extensively in Italy and at Covent Garden. When she played the part of Madama Butterfly, Puccini was said to be spellbound.
Link Information: The story is set in Japan Question: What is the setting of the opera in which Sheridan appeared in July of 1919?
Answer: Japan