Input: Late Middle Ages
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.

Who led led the Serbian Army at the Battle of Kosovo?
Output: Lazar Hrebljevanovic

Input: Article: Asphalt/bitumen can sometimes be confused with "coal tar", which is a visually similar black, thermoplastic material produced by the destructive distillation of coal. During the early and mid-20th century when town gas was produced, coal tar was a readily available byproduct and extensively used as the binder for road aggregates. The addition of tar to macadam roads led to the word tarmac, which is now used in common parlance to refer to road-making materials. However, since the 1970s, when natural gas succeeded town gas, asphalt/bitumen has completely overtaken the use of coal tar in these applications. Other examples of this confusion include the La Brea Tar Pits and the Canadian oil sands, both of which actually contain natural bitumen rather than tar. Pitch is another term sometimes used at times to refer to asphalt/bitumen, as in Pitch Lake.

Now answer this question: For what was coal tar used in road paving?

Output: binder

Article: Universities of Technology are categorised as universities, are allowed to grant B.Sc. (Tech.), M.Sc. (Tech.), Lic.Sc. (Tech.), Ph.D. and D.Sc.(Tech.) degrees and roughly correspond to Instituts de technologie of French-speaking areas and Technische Universitat of Germany in prestige. In addition to universities of technology, some universities, e.g. University of Oulu and Abo Akademi University, are allowed to grant the B.Sc. (tech.), M.Sc. (tech.) and D.Sc. (Tech.) degrees.

Question: What's the equivalent of Universities of Technology in French-speaking areas?
Ans: Instituts de technologie

Here is a question about this article: Edgar took the first turn at school, and Dwight was employed as a night supervisor at the Belle Springs Creamery. Edgar asked for a second year, Dwight consented and worked for a second year. At that time, a friend "Swede" Hazlet was applying to the Naval Academy and urged Dwight to apply to the school, since no tuition was required. Eisenhower requested consideration for either Annapolis or West Point with his U.S. Senator, Joseph L. Bristow. Though Eisenhower was among the winners of the entrance-exam competition, he was beyond the age limit for the Naval Academy. He then accepted an appointment to West Point in 1911.
What is the answer to this question: Why couldn't Eisenhower attend Annapolis?
****
So... beyond the age limit

The problem: Answer a question about this article:
Among the largest non-state-run research institutions in Portugal are the Instituto Gulbenkian de Ciencia and the Champalimaud Foundation, a neuroscience and oncology research centre, which in addition awards every year one of the highest monetary prizes of any science prize in the world. A number of both national and multinational high-tech and industrial companies, are also responsible for research and development projects. One of the oldest learned societies of Portugal is the Sciences Academy of Lisbon, founded in 1779.
What are two of the large non-state run research institutions in Portugal?
****
The answer: Instituto Gulbenkian de Ciencia and the Champalimaud Foundation

The problem: Answer a question about this article:
As heirs of the Dominican priory of Poissy in France, the Dartford sisters were also heirs to a tradition of profound learning and piety. Sections of translations of spiritual writings in Dartford's library, such as Suso's Little Book of Eternal Wisdom and Laurent du Bois' Somme le Roi, show that the "ghoostli" link to Europe was not lost in the crossing of the Channel. It survived in the minds of the nuns. Also, the nuns shared a unique identity with Poissy as a religious house founded by a royal house. The English nuns were proud of this heritage, and aware that many of them shared in England's great history as members of the noble class, as seen in the next chapter.
Where was the priory of Poissy located?
****
The answer:
France