In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Example input: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Example output: Who believes Fagin's gang make wallets and handkerchiefs?.
Example explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.
Q: Passage: While Lennon and Starr remained consistently friendly during the years that followed the Beatles' break-up in 1970, his relationships with McCartney and Harrison varied. He was initially close to Harrison, but the two drifted apart after Lennon moved to the US in 1971. When Harrison was in New York for his December 1974 Dark Horse tour, Lennon agreed to join him on stage, but failed to appear after an argument over Lennon's refusal to sign an agreement that would finally dissolve the Beatles' legal partnership. Harrison later said that when he visited Lennon during his five years away from music, he sensed that Lennon was trying to communicate, but his bond with Ono prevented him. Harrison offended Lennon in 1980 when he published an autobiography that made little mention of him. Lennon told Playboy, "I was hurt by it. By glaring omission ... my influence on his life is absolutely zilch ... he remembers every two-bit sax player or guitarist he met in subsequent years. I'm not in the book."Lennon's most intense feelings were reserved for McCartney. In addition to attacking him with the lyrics of "How Do You Sleep?", Lennon argued with him through the press for three years after the group split. The two later began to reestablish something of the close friendship they had once known, and in 1974, they even played music together again before eventually growing apart once more. During McCartney's final visit in April 1976, Lennon said that they watched the episode of Saturday Night Live in which Lorne Michaels made a $3,000 offer to get the Beatles to reunite on the show. The pair considered going to the studio to make a joke appearance, attempting to claim their share of the money, but were too tired. Lennon summarised his feelings towards McCartney in an interview three days before his death: "Throughout my career, I've selected to work with ... only two people: Paul McCartney and Yoko Ono ... That ain't bad picking."Along with his estrangement from McCartney, Lennon always felt a musical competitiveness with him and kept an ear on his music. During his career break from 1975 until shortly before his death, according to Fred Seaman, Lennon and Ono's assistant at the time, Lennon was content to sit back as long as McCartney was producing what Lennon saw as mediocre material. Lennon took notice when McCartney released "Coming Up" in 1980, which was the year Lennon returned to the studio. "It's driving me crackers!" he jokingly complained, because he could not get the tune out of his head. That same year, Lennon was asked whether the group were dreaded enemies or the best of friends, and he replied that they were neither, and that he had not seen any of them in a long time. But he also said, "I still love those guys. The Beatles are over, but John, Paul, George and Ringo go on.".
A:
What is the last name of the person that the man that was omitted from a friend's autobiography have a musical rivalry with?