Question: Fiorello Giraud created a roll in an opera that had how many acts?
Sentence (from "L'ajo nell'imbarazzo"): At its premiere at the Teatro Valle, Rome on 4 February 1824, it "was greeted with wild enthusiasm [and] it was with this opera that [...] Donizetti had his first really lasting success" During revisions planned for the 1826 production in Naples, Donizetti renamed the opera Don Gregorio, and it is under that name that most later productions were staged.
Relevant evidence: No