This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

[Q]: Solar distillation can be used to make saline or brackish water potable. The first recorded instance of this was by 16th-century Arab alchemists. A large-scale solar distillation project was first constructed in 1872 in the Chilean mining town of Las Salinas. The plant, which had solar collection area of 4,700 m2 (51,000 sq ft), could produce up to 22,700 L (5,000 imp gal; 6,000 US gal) per day and operate for 40 years. Individual still designs include single-slope, double-slope (or greenhouse type), vertical, conical, inverted absorber, multi-wick, and multiple effect. These stills can operate in passive, active, or hybrid modes. Double-slope stills are the most economical for decentralized domestic purposes, while active multiple effect units are more suitable for large-scale applications.
[A]: In what year was a large scale solar distillation project constructed in Las Salinas?


[Q]: While on one hand the Heian period was an unusually long period of peace, it can also be argued that the period weakened Japan economically and led to poverty for all but a tiny few of its inhabitants. The control of rice fields provided a key source of income for families such as the Fujiwara and were a fundamental base for their power. The aristocratic beneficiaries of Heian culture, the Ryōmin (良民 "Good People") numbered about five thousand in a land of perhaps five million. One reason the samurai were able to take power was that the ruling nobility proved incompetent at managing Japan and its provinces. By the year 1000 the government no longer knew how to issue currency and money was gradually disappearing. Instead of a fully realised system of money circulation, rice was the primary unit of exchange. The lack of a solid medium of economic exchange is implicitly illustrated in novels of the time. For instance, messengers were rewarded with useful objects, e.g., an old silk kimono, rather than paid a fee.
[A]: What crop was a primary source of income during the Heian period?


[Q]: Beginning his second effort that fall, West would invest two million dollars and take over a year to craft his second album. West was significantly inspired by Roseland NYC Live, a 1998 live album by English trip hop group Portishead, produced with the New York Philharmonic Orchestra. Early in his career, the live album had inspired him to incorporate string arrangements into his hip-hop production. Though West had not been able to afford many live instruments around the time of his debut album, the money from his commercial success enabled him to hire a string orchestra for his second album Late Registration. West collaborated with American film score composer Jon Brion, who served as the album's co-executive producer for several tracks. Although Brion had no prior experience in creating hip-hop records, he and West found that they could productively work together after their first afternoon in the studio where they discovered that neither confined his musical knowledge and vision to one specific genre. Late Registration sold over 2.3 million units in the United States alone by the end of 2005 and was considered by industry observers as the only successful major album release of the fall season, which had been plagued by steadily declining CD sales.
[A]:
What kind of ensemble did Kanye hire to work on his second album?