Question: Which opera has more acts, Faust or Mignon?
Sentence (from "Faust (opera)"): It debuted at the Théâtre Lyrique on the Boulevard du Temple in Paris on 19 March 1859, with influential sets designed by Charles-Antoine Cambon and Joseph Thierry, Jean Émile Daran, Édouard Desplechin, and Philippe Chaperon.
Relevant evidence: No