Which answer matches this clue: the 18th-century castrato singer known by his stage name, the most celebrated vocalist of his era?

• A Senesino
• B Caffarelli
• C Carestini
• D Farinelli ✓

Farinelli, born Carlo Broschi, possessed a three-octave range and served at the Spanish court for over two decades, curing King Philip V's depression with his singing.