Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

[EX Q]: Context: Amazonis Planitia is one of the smoothest plains on Mars. 
 Question: On what celestial body is Amazonis Planitia located?
[EX A]: mars

[EX Q]: Context: The film opens with Soichi Negishi (Kenichi Matsuama) walking along side his mother to a small country train station. Negishi hopes to move to Japan, and realize his musical dreams, as a pop singer. As he rides away in the train, he sees his younger brother wave to him from a field.Now we are taken to a dark alleyway, where many alternative Japanese youths are entering a club called "Hell's Gate." Inside we see a death metal band(in rather flamboyant attire, and black and white make-up) preforming for a large crowd. This band, is Detroit Metal City. The singer, is then revealed to be Negashi, and why crowd surfing he narrates of his dislike of what he has become.The opening credits roll.We now see Negashi removing his makeup with a rag, and talking a fellow band mate, which is his lazy, bloomer obsessed drummer Terumichi Nishida . He begs Nishida to return a video-game he had let him borrow, out of fear of him losing it. Now the band's bassist Masayuki Wada speaks to Negashi about how well he believed the show had done.The dressing room door bursts open, and with a wild laugh the President Of Death Records(who also seems to be the band's manager) enters, and tosses a cigarette into a ash tray that Wada held, but it simply bounced out and went out of frame. She told them of how well they did, but in remorse Negashi played for her a tape of the pop music he wishes to make. Displeased, she kicked him.Now with a swollen mouth, Negashi leaves the dressing room in his normal attire, and pushes his way through the crowd of oblivious screaming fans, hoping to get a look at the band. He is hit, and begins to bleed from the nose. As he made his way up the stairs, he heard the fans talk of rumors they had heard about the lead singer Krauser, such as his ability to rape many women.Negashi is now on the street, and he is playing his pop music on an acoustic guitar, with people only stoping to glance at him, and then walk away. He stops playing and hears some pop music being played around the corner. As he goes to investigate he sees that the lead singer of the band was an old college friend, and then that a woman standing near him was his college crush Yuri Aikawa.He reflects on the old days, of them all sitting around playing music together, and of his quote "No music, No dream."He is soon at a record store, looking at the latest fashionable cd covers, when he sees Aikawa, and they began to chat, and make plans to meet later at a cafe. Then a blast of near-by music startles him, and he walks to the next isle to investigate. Several DMC fans had gathered to celebrate the release of a new single with head-banging, and loud music. Negashi dislikes the album cover, and complains about a quote that was in his name, that he never said. Aikawa then tells him of her distaste for metal, and how unfashionable she finds Detroit Metal City.Negashi is now in full attire with his band, doing an interview about the new single. His mind is off daydreaming about Aikawa when he realizes it is time for their date and he runs out of the interview to meet her. Negashi is now constantly going back and forth between the date, and the interview, each time forgetting to remove more and more of his DMC attire. With a feeling that negashi was going into the near-by club, she enters in hopes of finding him, but meets Krauser crowd surfing. Negashi in fear, tries to get the crowd to move him away from her, but the get him closer and closer, until he felt his wig began to slip off. The only thing he could do to cover himself, was to lift up her dress, showing her underwear. She calls him a pig, and walks out.Now Negashi is outside of a cafe, and is banging on the wall in 
 Question: Who is he in stage costume?
[EX A]: krauser

[EX Q]: Context: The apolipoprotein E type 4 allele is a susceptibility gene for late-onset Alzheimer's disease. Apolipoprotein E is found in neurons, some of which contain paired helical filaments made of the microtubule-associated protein tau. Previous studies have demonstrated that the apoE3 isoform, but not the apoE4 isoform, binds tau with high avidity. Because the microtubule-associated protein MAP2c also effects microtubule assembly and stability, we examined interactions between apoE isoforms and MAP2c. Similar to the tau-binding results, apoE3, but not apoE4, bound MAP2c. Binding was detectable down to 10(-9) M MAP2c and 10(-8) M apoE3. Isoform-specific interactions of apoE with the microtubule-associated proteins MAP2c and tau might affect intracellular maintenance of microtubules and could contribute to a time-dependent pathogenesis of Alzheimer's disease. 
 Question: Which ApoE isoform is associated with atherosclerosis and Alzheimer's disease?
[EX A]:
apoe4 isoform