[Q]: The answer to the question: What is the name of the drilling fluid for which protective clothing, and in some cases masks, may be necessary for people exposed to it due to its flammability and corrosiveness? is inside the article: 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..., can you guess it ?
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[A]: n-Butyl acetate

input: Please answer the following: The answer to the question: Who did Joe Denton give a ride to? is inside the article: Joe Denton, a corrupt ex-cop, is released from jail. Six years earlier, while on the mob's payroll, Denton attacked district attorney Phil Coakley, earning him the enmity of the police and the nickname "slash cop". After finding his ex-wife has left the city with their children, he moves in with his elderly parents. Denton researches his ex-wife on the internet, eventually digging up a phone number. After briefly talking to one of his daughters, his ex-wife takes the phone and threatens to press charges if he ever contacts them again. Denton passes a bar on his way back home. Although a recovering alcoholic, he enters and orders a drink.  His friend Scotty, the brother of Denton's slain partner, greets him and offers him any help he needs. A young woman asks Denton for a ride home. Denton is surprised when she reveals herself to be Coakley's daughter and intentionally bloodies herself. Cued by her cries for help, two men drag Denton from his car; Denton beats both men savagely. After Denton is questioned by the police, Coakley admits the evidence backs up his story and reluctantly asks if Denton wants to press charges. Denton declines, saying he wants to leave his history in the past, to the disgust of Coakley and Lieutenant Pleasant, who calls him a disgrace. Pleasant, revealed to also be corrupt, demands Denton kill mob boss Manny Vassey, who has found religion on his deathbed. Pleasant explains Vassey's guilty conscience may lead him to confess to Coakley. Pleasant promises to help Denton renegotiate the terms of the settlement with his ex-wife if he kills Vassey.  At his house, Vassey denies the rumors. As Vassey falls asleep, Denton begins to suffocate him, only to be interrupted by Charlotte Boyd, Vassey's hospice nurse. Denton smoothly thanks her for her work and leaves the house, where he encounters Vassey's sadistic son, Junior. Junior threatens to kill Denton, enraged that Vassey would see him while avoiding his own son., can you guess it ?
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output: Coakley's daughter

Problem: The answer to the question: What is the name of the man who returns the key to Cabella? is inside the article: Upon receiving a key from her Uncle Max, Cabella travels to Italy where she discovers the key is related to a house named Cabella near a village. While traveling she stops near a waterfall to swim and loses the key, but a mysterious man returns the key. She then travels to the village, finds the house, and uses the key to open it. The next day she goes to the market where the mysterious man works and learns from his cousin Maria that his name is Leo and he is deaf and mute. Maria and Cabella become friends and Maria introduces her sisters Sophia and Giulia. Later that evening Maria tells Cabella that she has a crush on Lord Jai, a rich man from India that attended a boarding school. That night, Cabella has a conversation with a spirit named Angelo and has strange dreams about her mother.  The next morning, Cabella finds a basket with goods such as eggs and apples sent by Leo. Maria then takes Cabella to her sister Ambrosia's funeral because she died from a heart attack. That night Angelo visits her and confesses that she must go to the cemetery to learn more information. At the cemetery, she meets Senior Bronzini, who, according to rumors, had a relationship with a nun when he was younger. Cabella decides to leave flowers for Chiara, a woman buried next to Ambrosia who has no flowers., can you guess it ?

A:
Leo