In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

[Q]: Passage: Nannerl herself was an apt pupil, no less quick to learn than her brother, and was playing the keyboard with striking virtuosity by the time she was eleven. In that year, 1762, Leopold brought the children to Munich to play before Maximilian III Joseph, Elector of Bavaria. Leopold then took the entire family to Vienna, on a trip that lasted for three months. He had secured invitations from several noble patrons, and within three days of arriving the children were playing at the palace of Count Collalto. Among those present was the Viennese Treasury councillor and future prime minister Karl von Zinzendorf, who noted in his diary that "a little boy, said to be only five-and-a-half years old [Wolfgang was actually nearly seven], played the harpsichord". After an appearance before the Imperial Vice-Chancellor, the Mozarts were invited to the royal court, where the Empress Maria Theresa tested Wolfgang's abilities by requiring him to play with the keyboard covered. During this court visit Wolfgang met the Archduchess Maria Antonia, the future Queen Marie Antoinette of France, who was two months his senior. Mozart's biographer Eric Blom recounts an anecdote of how the Archduchess helped Wolfgang when he slipped on the polished floor; she is supposed to have received a proposal of marriage in return.As the Mozarts began to be noticed by the Viennese aristocracy, they were often required to give several performances during a single day. They were well rewarded for this activityat the end of their first hectic week in Vienna, Leopold was able to send home the equivalent of more than two years' salary. Their schedule was interrupted when Wolfgang fell ill with scarlet fever, and their former momentum was not regained. Nevertheless, the visit left Leopold eager to pursue further opportunities for social and financial success. On their return to Salzburg, Wolfgang played the harpsichord and violin at a birthday concert for the archbishop, to the evident astonishment of those present.
Question: Who played the keyboard with striking virtuosity?
[A]: Wolfgang.

[Q]: Passage: Elliot Hopper is a workaholic widower who is about to land the deal of a lifetime at work, which he hopes will win him a promotion and a company car. After he forgets his daughter Diane's birthday, he attempts to make it up to her by promising her she can have his car when he secures the deal at work on the coming Thursday. After being persuaded to give the car to his daughter early, Elliot must hail a taxi from work, which is driven by Satanist Curtis Burch, who drives erratically and is of control. Attempting to get the taxi stopped, Elliot announces that he is Satan and commands him to stop the taxi, and also attempts to give him his wallet. Shocked to see his "Evil Master", Burch drives off a bridge and into the river.
Elliot emerges from the accident scene, only to learn that he is a ghost when a police officer fails to notice him and a speeding bus goes straight through him. When he gets home he discovers that his three children can see him, but only in a totally dark room, and they can't hear him at times. He struggles to tell them what happened when he is whisked away to London by paranormal researcher Sir Edith, who tells him he is a ghost who has yet to enter the afterlife because "they screwed up"; his soul will not cross over until Thursday.
The pressures of work and family life lead to many comedic events, as Elliot attempts to renew his life insurance policy and complete his company's merger, so his family will be provided for once he crosses over. One day, he must choose between staying in an important work meeting and helping his son with a magic trick at school. He eventually decides that his family's happiness is more important and walks out on his furious boss, Mr. Collins, who later smugly fires him. Dejected, Elliot reveals himself as a ghost to his love interest, Joan, whose initial shock soon turns to sympathy.
Question: Who is Elliot Hopper's boss?
[A]: Mr. Collins.

[Q]: Passage: William "Bill" Boss, a psychopathic prison warden, watches the end of The Human Centipede 2 (Full Sequence) with his accountant, Dwight Butler. Bill says that he hates the films as his feet are massaged by his secretary, Daisy. Daisy replies that she enjoyed them. In response, Bill sucks his finger and inserts it into Daisy's vagina, telling her that women should not be allowed to voice their opinions. Dwight interrupts, attempting to pitch a "brilliant idea" to fix the prison's horrible retention and violence rates, but he is interrupted by a phone call.
Bill and Dwight are then summoned to the scene of an assault within the prison. One of the officers has been stabbed by an inmate. As punishment, Bill decides to stomp on the arm of the prisoner, exposing the bone and causing immense pain. He promises to do it again when his bones are healed.
Back in the Warden's office, Bill receives a mysterious package. After Dwight asks what it contains, Bill reveals that it is a jar of specially imported, dried African clitorises which he eats "for strength." After eating a few, he receives a threatening prank phone call from one of the inmates. Bill waterboards him with three buckets of boiling water, horribly disfiguring him. The inmate tells Bill that he has lost his soul.
Governor Hughes arrives immediately afterwards, ordering Bill and Dwight to put a stop to the violence and promising that they will both be fired otherwise. In anger and retaliation, Bill orders a 'mass castration' of the inmates, and castrates one of the prisoners himself. He covers his face in the blood of the inmate and later eats the cooked testicles for lunch, calling it "Energy Food." Daisy is forced to perform fellatio on Bill while Dwight is in the room. Upon completing the act, Daisy eats one of the dried clitorises, mistaking them for candy.
Question: What is the last name of the person who is interrupted by a phone call?
[A]:
Butler.