Question: Which had more acts: Il matrimonio segreto or Pelléas et Mélisande?
Sentence (from "Pelléas et Mélisande (opera)"): It premiered at the Opéra-Comique in Paris on 30 April 1902 with Jean Périer as Pelléas and Mary Garden as Mélisande in a performance conducted by André Messager, who was instrumental in getting the Opéra-Comique to stage the work.
Relevant evidence: No