Question: What composer was best known for his opera "Louise", Ludwig van Beethoven or Gustave Charpentier?
Sentence (from "Ludwig van Beethoven"): His best-known compositions include 9 symphonies, 5 piano concertos, 1 violin concerto, 32 piano sonatas, 16 string quartets, his great Mass the "Missa solemnis", and one opera, "Fidelio".
Relevant evidence: Yes