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.
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Question: Passage: Roy DuBro and Ed Klingbottom are garbage men who are constantly undermined by their corrupt boss Junior Assistant Dispatcher Trainee Stanley Snyder.
One day, the earth is secretly invaded by an army of flying saucers, commanded by a Darth Vader-esque alien called Glaxxon. A saucer abducts the two men and the aliens on board attempt to vivisect them. They awaken just in time and escape back to earth with an alien fire extinguisher. When they arrive late for work and try to tell Stanley about the aliens, he doesn't believe them, having heard every alien story ever from fellow worker Old Bob.
President Smith and his significantly more competent press secretary receive news about the invasion from General Vice and the President tells his advisor, Dr. Strangemeister, to find two people with alien experience and make them into secret agents. Unbeknownst to anyone, Strangemeister is secretly in league with Glaxon, who is infuriated by Ed and Roy's interference. Strangemeister hires the two of them, believing that they are destined to fail and transforms them into 'The Men in White'.
The aliens start abducting people all over the world. Roy suggests the two of them use a cow as bait. The plan works and they successfully capture an alien spaceship. They discover  a device that makes them forget the last several seconds, and the two of them get stuck in a continuous loop for several hours until its batteries run down. 
Question: Who hires the garbage men who work for a corrupt boss as secret agents??

Answer: Dr. Strangemeister.


Question: Passage: Manchester has a notable place in the history of Marxism and left-wing politics; being the subject of Friedrich Engels' work The Condition of the Working Class in England in 1844; Engels spent much of his life in and around Manchester, and when Karl Marx visited Manchester, they met at Chetham's Library. The economics books Marx was reading at the time can be seen in the library, as can the window seat where Marx and Engels would meet. The first Trades Union Congress was held in Manchester (at the Mechanics' Institute, David Street), from 2 to 6 June 1868. Manchester was an important cradle of the Labour Party and the Suffragette Movement.At that time, it seemed a place in which anything could happen—new industrial processes, new ways of thinking (the Manchester School, promoting free trade and laissez-faire), new classes or groups in society, new religious sects, and new forms of labour organisation. It attracted educated visitors from all parts of Britain and Europe. A saying capturing this sense of innovation survives today: "What Manchester does today, the rest of the world does tomorrow." Manchester's golden age was perhaps the last quarter of the 19th century. Many of the great public buildings (including Manchester Town Hall) date from then. The city's cosmopolitan atmosphere contributed to a vibrant culture, which included the Hallé Orchestra. In 1889, when county councils were created in England, the municipal borough became a county borough with even greater autonomy.
Although the Industrial Revolution brought wealth to the city, it also brought poverty and squalor to a large part of the population. Historian Simon Schama noted that "Manchester was the very best and the very worst taken to terrifying extremes, a new kind of city in the world; the chimneys of industrial suburbs greeting you with columns of smoke". An American visitor taken to Manchester's blackspots saw "wretched, defrauded, oppressed, crushed human nature, lying and bleeding fragments".The number of cotton mills in Manchester itself reached a peak of 108 in 1853. Thereafter the number began to decline and Manchester was surpassed as the largest centre of cotton spinning by Bolton in the 1850s and Oldham in the 1860s. However, this period of decline coincided with the rise of the city as the financial centre of the region. Manchester continued to process cotton, and in 1913, 65% of the world's cotton was processed in the area. The First World War interrupted access to the export markets. Cotton processing in other parts of the world increased, often on machines produced in Manchester. Manchester suffered greatly from the Great Depression and the underlying structural changes that began to supplant the old industries, including textile manufacture. 
Question: What place attracted educated visitors from all parts of Britain and Europe?

Answer: Manchester.


Question: Passage: Drilling fluids are necessary for borehole stability in deep cores, and can also be used to circulate cuttings away from the bit.  Fluids used include water, ethanol/water and water/ethylene glycol mixtures, petroleum fuels, non-aromatic hydrocarbons, and n-butyl acetate.
Water is the cheapest and cleanest option; it may be present on the glacial surface or may be created by thermal drilling.  In cold ice some form of antifreeze is necessary, or heat must be reapplied by reaming the hole periodically.
Ethanol and water.  Ethanol acts as an anti-freeze in water; at sufficient concentrations it can reduce the freezing temperature of the mixture to well below any temperature likely to be encountered in ice drilling.  The concentration must be chosen to prevent the liquid freezing and also to maintain the borehole against the ice overburden pressure.  Because the density of the mixture decreases with lower temperatures, vertical convection will develop in boreholes where temperatures decrease with depth, as the lighter mixture rises.  This causes slush to form in the borehole, though successful drilling is still possible.  Ethanol is one of the cheapest options for a drilling fluid, and requires less storage space than other options because in use it is diluted with water.  A Soviet expedition left an 800 m borehole in Antarctica filled with ethanol and water at an ice temperature of −53 °C; after 11 months the borehole remained open and drilling was resumed with no problems.  A problem with this option is that the mixture will penetrate cores that have cracks.
Ethylene glycol and water was used at Camp Century in 1966 in the lower part of the hole to dissolve the cuttings.
Petroleum fuels.  This includes diesel, jet fuel, and kerosene. They are inexpensive and easily available, and were once in common use; disadvantages include flammability and the aromatics they contain, which are a health hazard.
Non-aromatic hydrocarbons.  As of 2009 these had become the most commonly used drilling fluids; eliminating the aromatics resolved the health issues with these fluids.  They are significantly more expensive than untreated petroleum fuels.
n-Butyl acetate.  A widely used fuel in the 1990s, because it is a close match for the density of ice, this is now unpopular because it dissolves many materials, which prevents their use in the drilling equipment it comes in contact with.  It is also flammable and corrosive, and protective clothing and in some cases masks may be necessary for people exposed to it. 
Question: What is the name of the specific category of drilling fluid that includes includes diesel, jet fuel, and kerosene?

Answer:
Petroleum fuels.