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.

Context: Maria is a free-spirited young Austrian woman studying to become a nun at Nonnberg Abbey in Salzburg in 1938. Her love of music and the mountains, her youthful enthusiasm and imagination, and her lack of discipline cause some concern among the nuns. The Mother Abbess, believing Maria would be happier outside the abbey, sends her to the villa of retired naval officer Captain Georg von Trapp to be governess to his seven childrenLiesl, Friedrich, Louisa, Kurt, Brigitta, Marta, and Gretl. The Captain has been raising his children alone using strict military discipline following the death of his first wife. Although the children misbehave at first, Maria responds with kindness and patience, and soon the children come to trust and respect her. While the Captain is away in Vienna, Maria makes play clothes for the children and takes them around Salzburg and the surrounding mountains, and she teaches them how to sing. When the Captain returns to the villa with Baroness Elsa Schraeder, a wealthy socialite, and their mutual friend, Max Detweiler, they are greeted by Maria and the children returning from a boat ride on the lake that concludes when their boat overturns. Displeased by his children's clothes and activities, and Maria's impassioned appeal that he get closer to his children, the Captain orders her to return to the abbey. Just then he hears singing coming from inside the house and is astonished to see his children singing for the Baroness. Filled with emotion, the Captain joins his children, singing for the first time in years. Afterwards, he apologizes to Maria and asks her to stay. Impressed by the children's singing, Max proposes he enter them in the upcoming Salzburg Festival but the suggestion is immediately rejected by the Captain who will not allow his children to sing in public. He does agree, however, to organize a grand party at the villa. The night of the party, while guests in formal attire waltz in the ballroom, Maria and the children look on from the garden terrace. When the Captain notices Maria teaching Kurt the traditional Landler folk dance, he cuts in and partners with Maria in a graceful performance, culminating in a close embrace. Confused about her feelings, Maria blushes and breaks away. Later, the Baroness, who noticed the Captain's attraction to Maria, hides her jealousy while convincing Maria that she must return to the abbey. Back at the abbey, when Mother Abbess learns that Maria has stayed in seclusion to avoid her feelings for the Captain, she encourages her to return to the villa to look for her life. After Maria returns to the villa, she learns about the Captain's engagement to the Baroness and agrees to stay until they find a replacement governess. The Captain's feelings for Maria, however, have not changed, and after breaking off his engagement the Captain and Maria are married. While they are on their honeymoon, Max enters the children in the Salzburg Festival against their father's wishes. When they learn that Austria has been annexed into the Third Reich in the Anschluss, the couple return to their home, where a telegram awaits informing the Captain that he must report to the German Naval Headquarters in Bremerhaven to accept a commission in the German Navy. Strongly opposed to the Nazis and the Anschluss, the Captain tells his family they must leave Austria immediately. That night, as the von Trapp family attempt to leave, they are stopped by German soldiers waiting outside the villa. When questioned by Gauleiter Hans Zeller, the Captain maintains they are headed to the Salzburg Festival to perform. Zeller insists on escorting them to the festival, after which his men will accompany the Captain to Bremerhaven. Later that night at the festival, during their final number, the von Trapp family slip away and seek shelter at the nearby abbey, where Mother Abbess hides them in the cemetery crypt. Nazi soldiers soon arrive and search the abbey, but the family is able to escape using the caretaker's car. When the soldiers attempt to pursue, they discover their cars will not start as two nuns have removed parts of their engines. The next morning, after driving to the border, the von Trapp family make their 
 Question: IN In what city is the Von Trapp household?
austria

Context: Epstein-Barr virus (EBV) is a highly prevalent virus, transmitted via saliva, which often causes asymptomatic infection in children but frequently results in infectious mononucleosis in adolescents. Heterophile antibody tests, including the Monospot test, are red cell or latex agglutination assays, which detect antired cell antibodies produced as part of a polyclonal antibody response occurring during EBV infection. Heterophile antibody tests are rapid, cheap and specific tests that can be performed from the onset of symptoms of infectious mononucleosis. In adolescents, heterophile antibody tests have high specificity and sensitivity in the diagnosis of primary acute EBV infection. However, the tests have low sensitivity and low negative predictive value in young children and are not useful under the age of 4. Heterophile tests may be positive in other viral infections, autoimmune disease and haematological malignancies, but do not appear to be positive in primary bacterial infection. Virus-specific serology is required in children under the age of 4 or if an older child is heterophile negative. Virus-specific serology allows diagnosis and the pattern of positivity and negativity enables the clinician to stage the EBV infection. Virus-specific serology appears to have better sensitivity in young children, but there is cross-reaction with other herpesvirus infections, a longer turnaround time and it is more expensive to perform. Further research is needed to establish which children benefit from and hence require testing for heterophile antibodies, the cost-effectiveness of EBV investigations and whether heterophile titres have predictive value for the severity of infection and the likelihood of complications. 
 Question: Which virus can be diagnosed with the monospot test?
epstein-barr virus

Context: Imagine a huge bar magnet passing through Earths axis, as illustrated in Figure 24.10. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles and a magnetic field. Although a compass always points north, it doesnt point to Earths geographic north pole, which is located at 90 north latitude (see Figure 24.11). Instead, it points to Earths magnetic north pole, which is located at about 80 north latitude. Earths magnetic south pole is also located several degrees of latitude away from the geographic south pole. A compass pointer has north and south poles, and its north pole points to Earths magnetic north pole. Why does this happen if opposite poles attract? Why doesnt the compass needle point south instead? The answer may surprise you. Earths magnetic north pole is actually the south pole of magnet Earth! Its called the magnetic north pole to avoid confusion. Because its close to the geographic north pole, it would be confusing to call it the magnetic south pole. Like all magnets, Earth has a magnetic field. Earths magnetic field is called the magnetosphere. It is a huge region that extends outward from Earth for several thousand kilometers but is strongest at the poles. You can see the extent of the magnetosphere in Figure 24.12. For an animated version of the magnetosphere, watch the video at this URL: MEDIA Click image to the left or use the URL below. URL: Do you like to read science fiction? Science fiction writers are really creative. For example, an author might write about a time in the distant past when compasses pointed south instead of north. Actually, this idea isnt fictionits a fact! Earths magnetic poles have switched places repeatedly over the past hundreds of millions of years, each time reversing Earths magnetic field. This is illustrated in Figure 24.13. Scientists dont know for certain why magnetic reversals occur, but there is hard evidence showing that they have occurred. The evidence comes from rocks on the ocean floor. Look at Figure 24.14, which shows a ridge on the ocean floor. At the center of the ridge, hot magma pushes up through the crust and hardens into rock. Once the magma hardens, the alignment of magnetic domains in the rock is frozen in place forever. The newly hardened rock is then gradually pushed away from the ridge in both directions as more magma erupts and newer rock forms. Rock samples from many places on the ocean floor reveal that magnetic domains of rocks from different time periods are aligned in opposite directions. The evidence shows that Earths magnetic field reversed hundreds of times over the last 330 million years. The last reversal was less than a million years ago. What might happen if a magnetic reversal occurred in your lifetime? How might it affect you? You can learn more about Earths magnetic reversals at this URL: . The idea that Earth is a magnet is far from new. It was first proposed in 1600 by a British physician named William Gilbert. However, explaining why Earth acts like a magnet is a relatively recent discovery. It had to wait until the development of technologies such as seismographs, which detect and measure earthquake waves. Then scientists could learn about Earths inner structure (see Figure 24.15). They discovered that Earth has an inner and outer core and that the outer core consists of liquid metals, mainly iron and nickel. Scientists think that Earths magnetic field is generated by the movement of charged particles through the molten metals in the outer core. The particles move as Earth spins on its axis. The video at the URL below takes a closer look at how this occurs. MEDIA Click image to the left or use the URL below. URL: Earths magnetic field helps protect Earth and its organisms from harmful particles given off by the sun. Most of the particles are attracted to the north and south magnetic poles, where Earths magnetic field is strongest. This is also where relatively few organisms live. Another benefit of Earths magnetic field is its use for navigation. People use compasses to detect Earths magnetic north pole and tell direction. Many animals have natural "compasses" that work 
 Question: region deep inside Earth that consists of liquid metals

outer core