Problem: Virgil:

Dante made Virgil his guide in Hell and the greater part of Purgatory in The Divine Comedy. Dante also mentions Virgil in De vulgari eloquentia, along with Ovid, Lucan and Statius, as one of the four regulati poetae (ii, vi, 7).

How many books did Dante write?
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A: unanswerable

Problem: During the years 1940-1955, the rate of decline in the U.S. death rate accelerated from 2% per year to 8% per year, then returned to the historical rate of 2% per year. The dramatic decline in the immediate post-war years has been attributed to the rapid development of new treatments and vaccines for infectious disease that occurred during these years. Vaccine development continued to accelerate, with the most notable achievement of the period being Jonas Salk's 1954 development of the polio vaccine under the funding of the non-profit National Foundation for Infantile Paralysis. The vaccine process was never patented, but was instead given to pharmaceutical companies to manufacture as a low-cost generic. In 1960 Maurice Hilleman of Merck Sharp & Dohme identified the SV40 virus, which was later shown to cause tumors in many mammalian species. It was later determined that SV40 was present as a contaminant in polio vaccine lots that had been administered to 90% of the children in the United States. The contamination appears to have originated both in the original cell stock and in monkey tissue used for production. In 2004 the United States Cancer Institute announced that it had concluded that SV40 is not associated with cancer in people.
Who announced that SV40 was not associated with cancer?
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Answer: United States Cancer Institute

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Swiss citizens are universally required to buy health insurance from private insurance companies, which in turn are required to accept every applicant. While the cost of the system is among the highest it compares well with other European countries in terms of health outcomes; patients who are citizens have been reported as being, in general, highly satisfied with it. In 2012, life expectancy at birth was 80.4 years for men and 84.7 years for women the highest in the world. However, spending on health is particularly high at 11.4% of GDP (2010), on par with Germany and France (11.6%) and other European countries, and notably less than spending in the USA (17.6%). From 1990, a steady increase can be observed, reflecting the high costs of the services provided. With an ageing population and new healthcare technologies, health spending will likely continue to rise.
What do new high tech healthcare technologies translate to?
A: high costs of the services provided

Context and question: During the years immediately following the novel's publication, Harper Lee enjoyed the attention its popularity garnered her, granting interviews, visiting schools, and attending events honoring the book. In 1961, when To Kill a Mockingbird was in its 41st week on the bestseller list, it was awarded the Pulitzer Prize, stunning Lee. It also won the Brotherhood Award of the National Conference of Christians and Jews in the same year, and the Paperback of the Year award from Bestsellers magazine in 1962. Starting in 1964, Lee began to turn down interviews, complaining that the questions were monotonous, and grew concerned that attention she received bordered on the kind of publicity celebrities sought. Since the, she declined talking with reporters about the book. She also steadfastly refused to provide an introduction, writing in 1995: "Introductions inhibit pleasure, they kill the joy of anticipation, they frustrate curiosity. The only good thing about Introductions is that in some cases they delay the dose to come. Mockingbird still says what it has to say; it has managed to survive the years without preamble."
How many weeks did To Kill a Mockingbird remain on the bestsellers list when it won the Pulitzer Prize?
Answer: 41

Question: With a total area of 42.7 km2 (16.5 sq mi), New Delhi forms a small part of the Delhi metropolitan area. Because the city is located on the Indo-Gangetic Plain, there is little difference in elevation across the city. New Delhi and surrounding areas were once a part of the Aravalli Range; all that is left of those mountains is the Delhi Ridge, which is also called the Lungs of Delhi. While New Delhi lies on the floodplains of the Yamuna River, it is essentially a landlocked city. East of the river is the urban area of Shahdara. New Delhi falls under the seismic zone-IV, making it vulnerable to earthquakes.
Is there an answer to this question: The Delhi Ridge is also referred to by what name?

Answer: the Lungs of Delhi

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Most of the Low Countries had come under the rule of the House of Burgundy and subsequently the House of Habsburg. In 1549 Holy Roman Emperor Charles V issued the Pragmatic Sanction, which further unified the Seventeen Provinces under his rule. Charles was succeeded by his son, King Philip II of Spain. In 1568 the Netherlands, led by William I of Orange, revolted against Philip II because of high taxes, persecution of Protestants by the government, and Philip's efforts to modernize and centralize the devolved-medieval government structures of the provinces. This was the start of the Eighty Years' War.
What event started after the revolt let by King Philip II of Spain?
A:
unanswerable