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.

[EX Q]: Passage: Pete is a former advertising executive living a Beatnik–Bohemian life in a loft in New York City. Since living in the commune, Pete has turned into a cynical, misanthropic artist. The members of the commune are seemingly aimless, indolent or melancholy while waiting for the world to end; one member lives her life in a burlap sack, with only her bare feet protruding.
One day, a wayward toucan arrives at the loft. The toucan, which stowed away on a Greek banana boat from South America, carries a unique and highly contagious virus. The virus causes intense feelings of giddiness, happiness, and kindness in anyone affected by it.
Pete initially catches the virus and in an outbreak of euphoria, suddenly senses a purpose in his life. Pete's girlfriend Liz is initially horrified at his behavior change, and when she learns from nearby police about the bird's virus, tries to warn him, but he has already shaved his beard off and proposes marriage and conventional living. Pete plans to trick her and the members of his loft into getting infected, by pretending to be the nihilist German philosopher leader of a doomsday cult popular in the commune, and spreading it through close facial contact with them. In his disguise, he convinces Liz to let him kiss her, but he is soon revealed as himself. 
The now upbeat collective keep the toucan, nicknaming it "Amigo". They then decide to spread the virus to as many people as they can in New York City, disguising themselves in conventional dress. Liz remains physically immune, but the positivity she encounters from her friends leads her to respond in kind. When authorities show up to catch the bird, Pete and Liz spirit him away by Liz hiding him in her dress and pretending to be pregnant, though the ruse is complicated when "nice" police take the couple to a hospital to give birth. 
Question: What is the name of the character who hides in Liz's dress?
[EX A]: Amigo.

[EX Q]: Passage: Detective Mike Hoolihan is investigating the murder of Jennifer Rockwell, an astrophysicist at an observatory in New Orleans. She had presented a talk on black holes in the evening, but was found dead in the morning by the manager of the observatory. She had been shot in the face, but there was no weapon. There is a sock and a jar of moisturizing cream found at the scene.
The manager claims that he was out all night with an associate. The sock is traced to Jennifer's boyfriend, who claims he left hurriedly to work on a new theory.
Jennifer's home is full of tchotchkes and other old nick-nacks. Mike passes out when she picks up a Florida snow globe, and imagines unique blue marbles similar to one that is on a string around her neck. When she comes to, she talks about the marble, and how she doesn't remember where it came from. She was an orphan, and has always had it.
Her co-investigator and supervisor suggest that this looks like "The .38 Caliber Killer", who killed young women, but hadn't struck in many years. The murderer always exchanged nick nacks with his victims.
While doing a more detailed search of the area, Mike finds a gun in a case, and a red scarf she had been having dreams about. The gun, a .38 revolver, is traced to the observatory manager, who admits he found it, and tried to dispose of it so he wouldn't be a suspect.
Figuring from where the gun originally lay, Mike concludes that Jennifer had shot herself. The investigators agree.
In photos of the crime scene, Mike realizes that there are no photos of the jar of moisturizing cream that she noted. When she buys a jar of the cream, she reacts as if memories come flooding back. 
Question: What is the last name of the person who talks about the marble?
[EX A]: Hoolihan.

[EX Q]: Passage: The seabed contains enormous reserves of minerals which can be exploited by dredging. This has advantages over land-based mining in that equipment can be built at specialised shipyards and infrastructure costs are lower. Disadvantages include problems caused by waves and tides, the tendency for excavations to silt up and the washing away of spoil heaps. There is a risk of coastal erosion and environmental damage.
Seafloor massive sulphide deposits are potential sources of silver, gold, copper, lead and zinc and trace metals since their discovery in the 1960s. They form when geothermally heated water is emitted from deep sea hydrothermal vents known as "black smokers". The ores are of high quality but prohibitively costly to extract. Small scale mining of the deep sea floor is being developed off the coast of Papua New Guinea using robotic techniques, but the obstacles are formidable.There are large deposits of petroleum, as oil and natural gas, in rocks beneath the seabed. Offshore platforms and drilling rigs extract the oil or gas and store it for transport to land. Offshore oil and gas production can be difficult due to the remote, harsh environment. Drilling for oil in the sea has environmental impacts. Animals may be disorientated by seismic waves used to locate deposits, probably causing the beaching of whales. Toxic substances such as mercury, lead and arsenic may be released. The infrastructure may cause damage, and oil may be spilt.Large quantities of methane clathrate exist on the seabed and in ocean sediment at a temperature of around 2 °C (36 °F) and these are of interest as a potential energy source. Some estimates put the amount available at between one and 5 million cubic kilometres (0.24 to 1.2 million cubic miles). Also on the seabed are manganese nodules formed of layers of iron, manganese and other hydroxides around a core. In the Pacific these may cover up to 30 percent of the deep ocean floor. The minerals precipitate from seawater and grow very slowly. Their commercial extraction for nickel was investigated in the 1970s but abandoned in favour of more convenient sources. In suitable locations, diamonds are gathered from the seafloor using suction hoses to bring gravel ashore. In deeper waters, mobile seafloor crawlers are used and the deposits are pumped to a vessel above. In Namibia, more diamonds are now collected from marine sources than by conventional methods on land. 
Question: Which ores are of high quality but prohibitively costly to extract?
[EX A]:
silver.