Task: Question Answering
Input (English): Passage: Massenet was born at Montaud, then an outlying hamlet and now a part of the city of Saint-Étienne, in the Loire. He was the youngest of the four children of Alexis Massenet (1788–1863) and his second wife Eléonore-Adelaïde née Royer de Marancour (1809–1875); the elder children were Julie, Léon and Edmond. Massenet senior was a prosperous ironmonger; his wife was a talented amateur musician who gave Jules his first piano lessons. By early 1848 the family had moved to Paris, where they settled in a flat in Saint-Germain-des-Prés. Massenet was educated at the Lycée Saint-Louis and, from either 1851 or 1853, the Paris Conservatoire. According to his colourful but unreliable memoirs, Massenet auditioned in October 1851, when he was nine, before a judging panel comprising Daniel Auber, Fromental Halévy, Ambroise Thomas and Michele Carafa, and was admitted at once. His biographer Demar Irvine dates the audition and admission as January 1853. Both sources agree that Massenet continued his general education at the lycée in tandem with his musical studies.
Ambroise Thomas, my beloved master, came towards me and said, "Embrace Berlioz, you owe him a great deal for your prize." "The prize," I cried, bewildered, my face shining with joy. "I have the prize!!!" I was deeply moved and I embraced Berlioz, then my master, and finally Monsieur Auber. Monsieur Auber comforted me. Did I need comforting? Then he said to Berlioz pointing to me, "He'll go far, the young rascal, when he's had less experience!"
The prize brought a well-subsidised three-year period of study, two-thirds of which was spent at the French Academy in Rome, based at the Villa Medici. At that time the academy was dominated by painters rather than musicians; Massenet enjoyed his time there, and made lifelong friendships with, among others, the sculptor Alexandre Falguière and the painter Carolus-Duran, but the musical benefit he derived was largely self-taught. He absorbed the music at St Peter's, and closely studied the works of the great German masters, from Handel and Bach to contemporary composers. During his time in Rome, Massenet met Franz Liszt, at whose request he gave piano lessons to Louise-Constance "Ninon" de Gressy, the daughter of one of Liszt's rich patrons. Massenet and Ninon fell in love, but marriage was out of the question while he was a student with modest means. 
Question: What is the last name of the person that gave piano lessons to Louise-Constance "Ninon" de Gressy?
Output (English): Massenet.