Which answer matches this clue: Donizetti's bel canto opera whose famous mad scene is a coloratura soprano showpiece?

• A Anna Bolena
• B Lucrezia Borgia
• C Maria Stuarda
• D Lucia di Lammermoor ✓

The mad scene of Lucia di Lammermoor, with its extended flute obbligato, is one of the most demanding and celebrated arias in the soprano repertoire.