Question: Caritea, regina di Spagna premiered at what opera house that in the 19th century, became the site of many famous operatic premieres at which the works of several of the four major bel canto era composers were performed?
{'answer': 'Teatro La Fenice', 'supporting_facts': [['Caritea, regina di Spagna', 1], ['La Fenice', 0], ['La Fenice', 2]]}