Problem: Flowering plant:

The flowering plants (angiosperms), also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants, with about 350,000 species. Like gymnosperms, angiosperms are seed-producing plants; they are distinguished from gymnosperms by characteristics including flowers, endosperm within the seeds, and the production of fruits that contain the seeds. Etymologically, angiosperm means a plant that produces seeds within an enclosure, in other words, a fruiting plant. The term "angiosperm" comes from the Greek composite word (angeion-, "case" or "casing", and sperma, "seed") meaning "enclosed seeds", after the enclosed condition of the seeds.

What does an angiosperm produce its seeds within?
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A: an enclosure


Problem: The exodus of Salvadorans was a result of both economic and political problems. The largest immigration wave occurred as a result of the Salvadoran Civil War in the 1980s, in which 20–30% of El Salvador's population emigrated. About 50%, or up to 500,000 of those who escaped headed to the United States, which was already home to over 10,000 Salvadorans, making Salvadorans Americans the fourth-largest Hispanic and Latino American group, after the Mexican-American majority, stateside Puerto Ricans, and Cubans.
How many Salvadorans came to the US?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
At the end of the 15th century the Ottoman Empire advanced all over Southeastern Europe, eventually conquering the Byzantine Empire and extending control over the Balkan states. Hungary was the last bastion of the Latin Christian world in the East, and fought to keep its rule over a period of two centuries. After the tragic death of the young king Vladislaus I of Hungary during the Battle of Varna in 1444 against the Ottomans, the Kingdom was placed in the hands of count John Hunyadi, who became Hungary's regent-governor (1446–1453). Hunyadi was considered one of the most relevant military figures of the 15th century: Pope Pius II awarded him the title of Athleta Christi or Champion of Christ for being the only hope of resisting the Ottomans from advancing to Central and Western Europe.
In what year didn't the Battle of Varna take place?
A: unanswerable


Context and question: In infrared photography, infrared filters are used to capture the near-infrared spectrum. Digital cameras often use infrared blockers. Cheaper digital cameras and camera phones have less effective filters and can "see" intense near-infrared, appearing as a bright purple-white color. This is especially pronounced when taking pictures of subjects near IR-bright areas (such as near a lamp), where the resulting infrared interference can wash out the image. There is also a technique called 'T-ray' imaging, which is imaging using far-infrared or terahertz radiation. Lack of bright sources can make terahertz photography more challenging than most other infrared imaging techniques. Recently T-ray imaging has been of considerable interest due to a number of new developments such as terahertz time-domain spectroscopy.
What is another name for terahertz radiation?
Answer: far-infrared


Question: The developments during World War II continued for a short time into the post-war period as well. In particular the U.S. Army set up a huge air defence network around its larger cities based on radar-guided 90 mm and 120 mm guns. US efforts continued into the 1950s with the 75 mm Skysweeper system, an almost fully automated system including the radar, computers, power, and auto-loading gun on a single powered platform. The Skysweeper replaced all smaller guns then in use in the Army, notably the 40 mm Bofors. In Europe NATO's Allied Command Europe developed an integrated air defence system, NATO Air Defence Ground Environment (NADGE), that later became the NATO Integrated Air Defence System.
Is there an answer to this question: What did NADGE become?

Answer: the NATO Integrated Air Defence System


Problem: Montevideo:

According to the census survey carried out between 15 June and 31 July 2004, Montevideo had a population of 1,325,968 persons, compared to Uruguay's total population of 3,241,003. The female population was 707,697 (53.4%) while the male population accounted for 618,271 (46.6%). The population had declined since the previous census carried out in 1996, with an average annual growth rate of −1.5 per thousand. Continual decline has been documented since the census period of 1975–1985, which showed a rate of −5.6 per thousand. The decrease is due in large part to lowered fertility, partly offset by mortality, and to a smaller degree in migration. The birth rate declined by 19% from 1996 (17 per thousand) to 2004 (13.8 per thousand). Similarly, the total fertility rate (TFR) declined from 2.24 in 1996 to 1.79 in 2004. However, mortality continued to fall with life expectancy at birth for both sexes increasing by 1.73 years.

According to the census survey carried out between 15 June and 31 July 2004, what was Uruguay's population?
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A:
3,241,003