In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
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Question: Passage: Recording sessions for The Joshua Tree began in January 1986 in Danesmoate House in Dublin and continued throughout the year. U2 briefly interrupted these sessions in June to join Amnesty International's A Conspiracy of Hope tour of benefit concerts. Following the first concert in San Francisco, lead singer Bono met René Castro, a Chilean mural artist. Castro had been tortured and held in a concentration camp for two years by the dictatorial Chilean government because his artwork criticised the Pinochet-led regime that seized power in 1973 during a coup d'état. Castro showed Bono a wall painting in the Mission District that depicted the ongoing plight in Chile and Argentina. He also learned of the Madres de Plaza de Mayo, a group of women whose children were forcibly disappeared by the Argentine government. The Madres' children were students who had opposed the government during the Dirty War, and the coup d'état that brought Jorge Rafael Videla to power. The Madres joined together to campaign for information regarding the locations of their children's bodies and the circumstances of their deaths, believing them to have been kidnapped, tortured, and murdered.Inspired by the mural, Bono took an extended break from recording into July, traveling to Nicaragua and El Salvador with his wife, Alison Hewson, to see first-hand the distress of peasants bullied by political conflicts and US military intervention. While there, they worked with the Central American Mission Partners (CAMP), a human rights and economic development organization. In El Salvador they met members of the Comité de Madres Monsignor Romero (COMADRES: Committee of the Mothers Monsignor Romero), an organization of women whose children were forcibly disappeared by the Salvadoran government during the Civil War because they opposed the military regime that was in power. At one point during the trip, Bono, Alison, and a member of CAMP were shot at by government troops while on their way to deliver aid to a group of farmers. The shots were a warning and, according to author John Luerssen, the incident made Bono realize that "they didn't care for their intrusion and they could kill them if they felt compelled."In 2006, Bono recounted another experience he had in El Salvador, where he had seen a body thrown from a van into the road. He remarked, "People would just disappear. If you were part of the opposition, you might find an SUV with the windows blacked out parked outside your house.... If that didn't stop you, occasionally they would come in and take you and murder you; there would be no trial." Bono understood the cause of the Madres and COMADRES and wanted to pay tribute to it. His experiences in Central America inspired the lyrics of "Mothers of the Disappeared" and another track from The Joshua Tree, "Bullet the Blue Sky".

Answer: What is the first name of the person whose artwork criticized the Pinochet-led regime that seized power in 1973?


Question: Passage: Maiden Castle is an Iron Age hill fort 1.6 miles (2.6 km) south west of Dorchester, in the English county of Dorset. Hill forts were fortified hill-top settlements constructed across Britain during the Iron Age.
The earliest archaeological evidence of human activity on the site consists of a Neolithic causewayed enclosure and bank barrow. In about 1800 BC, during the Bronze Age, the site was used for growing crops before being abandoned. Maiden Castle itself was built in about 600 BC; the early phase was a simple and unremarkable site, similar to many other hill forts in Britain and covering 6.4 hectares (16 acres). Around 450 BC it was greatly expanded and the enclosed area nearly tripled in size to 19 ha (47 acres), making it the largest hill fort in Britain and, by some definitions, the largest in Europe. At the same time, Maiden Castle's defences were made more complex with the addition of further ramparts and ditches. Around 100 BC, habitation at the hill fort went into decline and became concentrated at the eastern end of the site. It was occupied until at least the Roman period, by which time it was in the territory of the Durotriges, a Celtic tribe.
After the Roman conquest of Britain in the 1st century AD, Maiden Castle appears to have been abandoned, although the Romans may have had a military presence on the site. In the late 4th century AD, a temple and ancillary buildings were constructed. In the 6th century AD the hill top was entirely abandoned and was used only for agriculture during the medieval period.
Maiden Castle has provided inspiration for composer John Ireland and authors Thomas Hardy and John Cowper Powys. The study of hill forts was popularised in the 19th century by archaeologist Augustus Pitt Rivers. In the 1930s, archaeologist Mortimer Wheeler and Tessa Verney Wheeler undertook the first archaeological excavations at Maiden Castle, raising its profile among the public. Further excavations were carried out under Niall Sharples, which added to an understanding of the site and repaired damage caused in part by the large number of visitors. Today the site is protected as a Scheduled Ancient Monument and is maintained by English Heritage.

Answer: Who currently maintains Maiden Castle?


Question: Passage: The day after the Britain's Got Talent finals, Max Clifford, speaking for Simon Cowell, said that it was "quite possible" that Cowell would be signing some of the finalists, including Smith. Though she did not sign with Syco, Cowell's record label, she did record a duet of "Walking in the Air" with Johnston, which appeared on his debut album, One Voice, and was tipped as a potential Christmas number-one. Before the release of One Voice, it was revealed that Smith and her father were finalising the details of her record deal. In November, it was announced that Smith would be performing on stage in Kettering with Sylvia Berryman, a vocal tutor who had worked with Smith prior to her appearance on Britain's Got Talent. Smith said that she was "really looking forward to singing locally again", and it was again reported that Smith hoped to soon sign her own record deal.In December 2008 the Daily Mail reported that Smith had signed a £2.3 million, multi-album deal with Universal Music Group that was the "most lucrative recording contract ever handed to a schoolgirl". Smith said "I'm honoured to be joining such a fantastic record company, especially since it's where [Jenkins] started." Dickon Stainer, speaking on behalf of Universal, said "as soon as we saw Faryl, it became an ambition to sign her." Universal claimed it intended to market Smith as a pop star. Smith signed the contract at the Royal Albert Hall, following which she performed with Katherine Jenkins. Neil Fisher, writing for The Times, described Smith as "heir apparent" to Jenkins; the pair had first met when Smith won a competition at the Llangollen International Musical Eisteddfod. By 2009, Jenkins was acting as a mentor to Smith.In January 2009 plans were released for Smith to perform with Plácido Domingo, an idea originally suggested by him. In an interview with the Metro, Smith talked about her future plans, insisting that she did not wish to be dubbed as the next Charlotte Church. She later said that "In the papers, it sounded like I was snobby when I said 'I don't want to be like Charlotte Church', but I didn't mean it like that." She has also spoken of her desire to appear in films on top of her musical career. She said "Films and movies are something I'd really like to do. I've always wanted to act so doing a film would be amazing.".

Answer:
What is the last name of the person who recorded a duet of "Walking in the Air" with Johnston?