Problem: Diarrhea:

Basic sanitation techniques can have a profound effect on the transmission of diarrheal disease. The implementation of hand washing using soap and water, for example, has been experimentally shown to reduce the incidence of disease by approximately 4248%. Hand washing in developing countries, however, is compromised by poverty as acknowledged by the CDC: "Handwashing is integral to disease prevention in all parts of the world; however, access to soap and water is limited in a number of less developed countries. This lack of access is one of many challenges to proper hygiene in less developed countries." Solutions to this barrier require the implementation of educational programs that encourage sanitary behaviours.

Where is education integral to prevent disease?
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A: unanswerable

Problem: Ford Motor Company and Coca-Cola were two of the first sponsors of American Idol in its first season. The sponsorship deal cost around $10 million in season one, rising to $35 million by season 7, and between $50 to $60 million in season 10. The third major sponsor AT&T Wireless joined in the second season but ended after season 12, and Coca-Cola officially ended its sponsorship after season 13 amidst the declining ratings of Idol in the mid-2010s. iTunes sponsored the show since season seven.
When did Coca-Cola stop being a sponsor of American Idol?
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Answer: after season 13

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Other major campus installations include towers in Montreal, Paris, and Atlanta; software labs in Raleigh-Durham, Rome, Cracow and Toronto; Johannesburg, Seattle; and facilities in Hakozaki and Yamato. The company also operates the IBM Scientific Center, Hursley House, the Canada Head Office Building, IBM Rochester, and the Somers Office Complex. The company's contributions to architecture and design, which include works by Eero Saarinen, Ludwig Mies van der Rohe, and I.M. Pei, have been recognized. Van der Rohe's 330 North Wabash building in Chicago, the original center of the company's research division post-World War II, was recognized with the 1990 Honor Award from the National Building Museum.
What building did Van der Rohe create for IBM?
A: 330 North Wabash building in Chicago

Context and question: On 25 May 2011 the Swiss government announced that it plans to end its use of nuclear energy in the next 2 or 3 decades. "The government has voted for a phaseout because we want to ensure a secure and autonomous supply of energy", Energy Minister Doris Leuthard said that day at a press conference in Bern. "Fukushima showed that the risk of nuclear power is too high, which in turn has also increased the costs of this energy form." The first reactor would reportedly be taken offline in 2019 and the last one in 2034. Parliament will discuss the plan in June 2011, and there could be a referendum as well.
When is Switzerland's first nuclear reactor scheduled to be taken offline?
Answer: 2019

Question: The Bulgarian Empire was in decline by the 14th century, and the ascendancy of Serbia was marked by the Serbian victory over the Bulgarians in the Battle of Velbazhd in 1330. By 1346, the Serbian king Stefan Dusan had been proclaimed emperor. Yet Serbian dominance was short-lived; the Serbian army led by the Lazar Hrebljevanovic was defeated by the Ottomans at the Battle of Kosovo in 1389, where most of the Serbian nobility was killed and the south of the country came under Ottoman occupation, as much of southern Bulgaria had become Ottoman territory in 1371. Northern remnants of Bulgaria were finally conquered by 1396, Serbia fell in 1459, Bosnia in 1463, and Albania was finally subordinated in 1479 only a few years after the death of Skanderbeg. Belgrade, an Hungarian domain at the time, was the last large Balkan city to fall under Ottoman rule, in 1521. By the end of the medieval period, the entire Balkan peninsula was annexed by, or became vassal to, the Ottomans.
Is there an answer to this question: Who led led the Serbian Army at the Battle of Kosovo?

Answer: Lazar Hrebljevanovic

Problem: Marshall Islands:

On September 15, 2007, Witon Barry (of the Tobolar Copra processing plant in the Marshall Islands capital of Majuro) said power authorities, private companies, and entrepreneurs had been experimenting with coconut oil as alternative to diesel fuel for vehicles, power generators, and ships. Coconut trees abound in the Pacific's tropical islands. Copra, the meat of the coconut, yields coconut oil (1 liter for every 6 to 10 coconuts). In 2009, a 57 kW solar power plant was installed, the largest in the Pacific at the time, including New Zealand. It is estimated that 330 kW of solar and 450 kW of wind power would be required to make the College of the Marshall Islands energy self-sufficient. Marshalls Energy Company (MEC), a government entity, provides the islands with electricity. In 2008, 420 solar home systems of 200 Wp each were installed on Ailinglaplap Atoll, sufficient for limited electricity use.

Who did Witon Barry work for?
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A:
the Tobolar Copra processing plant