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.

Example Input: Passage: Curiously, it appears that the Greeks did not "breed" their slaves, at least during the Classical Era, though the proportion of houseborn slaves appears to have been rather large in Ptolemaic Egypt and in manumission inscriptions at Delphi. Sometimes the cause of this was natural; mines, for instance, were exclusively a male domain. On the other hand, there were many female domestic slaves. The example of African slaves in the American South on the other hand demonstrates that slave populations can multiply.Xenophon advised that male and female slaves should be lodged separately, that "…nor children born and bred by our domestics without our knowledge and consent—no unimportant matter, since, if the act of rearing children tends to make good servants still more loyally disposed, cohabiting but sharpens ingenuity for mischief in the bad." The explanation is perhaps economic; even a skilled slave was cheap, so it may have been cheaper to purchase a slave than to raise one. Additionally, childbirth placed the slave-mother's life at risk, and the baby was not guaranteed to survive to adulthood.Houseborn slaves (oikogeneis) often constituted a privileged class. They were, for example, entrusted to take the children to school; they were "pedagogues" in the first sense of the term. Some of them were the offspring of the master of the house, but in most cities, notably Athens, a child inherited the status of its mother. 
Question: What were entrusted to take children to school?
Example Output: oikogeneis.

Example Input: Passage: Increasing tourist and commercial interest in petrified wood during the late 19th century began to alarm residents of the region. In 1895, the Arizona Territorial Legislature asked the U.S. Congress to create a petrified forest national park. Although this first attempt failed, in 1906 the Antiquities Act signed by President Theodore Roosevelt was used to create the Petrified Forest National Monument. Between 1934 and 1942, the federal Civilian Conservation Corps built road, trails, and structures in the monument, and the government acquired additional land in the Painted Desert section. The monument became a national park in 1962. Six years after the signing of the Wilderness Act in 1964 by President Lyndon B. Johnson, wilderness areas (where human activity is limited), were designated in the park. In 2004, President George W. Bush signed a bill authorizing the eventual expansion of the park from 93,353 acres (about 146 mi2 or 378 km2) to 218,533 acres (about 341 mi2 or 884 km2). Theft of petrified wood is still a problem. Despite a guard force of seven National Park Service rangers, fences, warning signs, and the threat of a $325 fine, an estimated 12 short tons (11,000 kg) of the fossil wood is stolen from the Petrified Forest every year.Jessee Walter Fewkes, the first archeologist to visit Puerco Ruin, predicted in the late 19th century that it would yield many artifacts. Conservationist John Muir conducted the first excavations of the ruin in 1905–06. Although he did not publish his findings, he urged the federal government to preserve Petrified Forest. Professional archeological work in the park began in the early 20th century when Walter Hough conducted excavations at Puerco Ruin and other sites.  In 1919, a phytosaur skull was discovered near Blue Mesa in the Petrified Forest and sent to the Museum of Paleontology in Berkeley, California.  In 1921, Annie Alexander, founder of the museum, visited Blue Mesa to collect more of the phytosaur and other specimens; this led to further excavations by paleontologist Charles Camp.  Since then, more than 250 fossil sites have been documented in the park. In the 1930s, the Civil Works Administration funded research in the park by archeologists H.P. Mera and C.B. Cosgrove. A National Park Service resurvey of the Petrified Forest in the early 1940s identified most of the large sites with stone ruins, and subsequent surveys since 1978 have identified a total of more than 600 artifact sites, many of them small. Research in paleontology and archeology continues at the park in the 21st century. 
Question: Who urged the federal government to preserve Petrified Forest?
Example Output: John Muir.

Example Input: Passage: Trafford Park was largely turned over to the production of war materiel during the Second World War, such as the Avro Manchester and Avro Lancaster heavy bombers, and the Rolls-Royce Merlin engines used to power the Spitfire, Hurricane, Mosquito and the Lancaster. The engines were made by Ford, under licence. The 17,316 workers employed in Ford's purpose-built factory had produced 34,000 engines by the war's end. The facility was designed in two separate sections to minimise the impact of bomb damage on production. The wood-working factory of F. Hills & Sons built more than 800 Percival Proctor aircraft for the RAF between 1940 and 1945, which were flight tested at the nearby Barton Aerodrome. Other companies produced gun bearings, steel tracks for Churchill tanks, munitions, Bailey bridges, and much else. ICI built and operated the first facility in the UK able to produce penicillin in quantity.As an important industrial area, the park suffered from extensive bombing, particularly during the Manchester Blitz of December 1940. On the night of 23 December 1940, the Metropolitan-Vickers aircraft factory in Mosley Road was badly damaged, with the loss of the first 13 MV-built Avro Manchester bombers in final assembly. The new Ford factory producing aircraft engines was bombed only a few days after its opening in May 1941. Trafford Hall was severely damaged by bombing, and was demolished shortly after the war ended.In the December 1940 air raids, stray bombs aiming for Trafford Park landed on Old Trafford football stadium, the nearby home of Manchester United, but this air raid only resulted in minor damage and matches were soon being played at the stadium again. On 11 March 1941, however, stray bombs aimed at Trafford Park fell onto Old Trafford for a second time, causing serious damage to the stadium. It was comprehensively rebuilt after the war and re-opened in 1949, until which time Manchester United played their home games at Maine Road, the stadium of Manchester City in Moss Side.At the outbreak of war in 1939 there were an estimated 50,000 workers employed in the park. By the end of the war in 1945 that number had risen to 75,000, probably the peak size of the park's workforce; Metropolitan-Vickers alone employed 26,000. 
Question: What team played permanently at the temporary stadium of the team who usually played at Old Trafford?
Example Output:
Manchester City.