Problem: Alsace:

From the annexation of Alsace by France in the 17th century and the language policy of the French Revolution up to 1870, knowledge of French in Alsace increased considerably. With the education reforms of the 19th century, the middle classes began to speak and write French well. The French language never really managed, however, to win over the masses, the vast majority of whom continued to speak their German dialects and write in German (which we would now call "standard German").[citation needed]

When did Germany annex Alsace?
---
A: unanswerable


Problem: In 821/822 CE Tibet and China signed a peace treaty. A bilingual account of this treaty, including details of the borders between the two countries, is inscribed on a stone pillar which stands outside the Jokhang temple in Lhasa. Tibet continued as a Central Asian empire until the mid-9th century, when a civil war over succession led to the collapse of imperial Tibet. The period that followed is known traditionally as the Era of Fragmentation, when political control over Tibet became divided between regional warlords and tribes with no dominant centralized authority.
When did Tibet and China sign a peace treaty?
---
Answer: 821/822 CE


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
There are several major exceptions on tuition fees. In many European countries, it is possible to study without tuition fees. Public universities in Nordic countries were entirely without tuition fees until around 2005. Denmark, Sweden and Finland then moved to put in place tuition fees for foreign students. Citizens of EU and EEA member states and citizens from Switzerland remain exempted from tuition fees, and the amounts of public grants granted to promising foreign students were increased to offset some of the impact.
Until what year were public universities in the UK free of tuition?
A: unanswerable


Context and question: Feynman's other work at Los Alamos included calculating neutron equations for the Los Alamos "Water Boiler", a small nuclear reactor, to measure how close an assembly of fissile material was to criticality. On completing this work he was transferred to the Oak Ridge facility, where he aided engineers in devising safety procedures for material storage so that criticality accidents (for example, due to sub-critical amounts of fissile material inadvertently stored in proximity on opposite sides of a wall) could be avoided. He also did theoretical work and calculations on the proposed uranium hydride bomb, which later proved not to be feasible.
What was the Water Boiler that Feyman worked on?
Answer: nuclear reactor


Question: In the century after the death of Osman I, Ottoman rule began to extend over the Eastern Mediterranean and the Balkans. Osman's son, Orhan, captured the northwestern Anatolian city of Bursa in 1324, and made it the new capital of the Ottoman state. This Ottoman conquest meant the loss of Byzantine control over northwestern Anatolia. The important city of Thessaloniki was captured from the Venetians in 1387. The Ottoman victory at Kosovo in 1389 effectively marked the end of Serbian power in the region, paving the way for Ottoman expansion into Europe. The Battle of Nicopolis in 1396, widely regarded as the last large-scale crusade of the Middle Ages, failed to stop the advance of the victorious Ottoman Turks.
Is there an answer to this question: In what year did the Ottoman's have a victory at Kosovo?

Answer: 1389


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The characteristic forms that were to define Gothic architecture grew out of Romanesque architecture and developed at several different geographic locations, as the result of different influences and structural requirements. While barrel vaults and groin vaults are typical of Romanesque architecture, ribbed vaults were used in the naves of two Romanesque churches in Caen, Abbey of Saint-Étienne and Abbaye aux Dames in 1120. Another early example is the nave and apse area of the Cathedral of Cefalù in 1131. The ribbed vault over the north transept at Durham Cathedral in England, built from 1128 to 1133, is probably earlier still and was the first time pointed arches were used in a high vault.
What type of vaults were lost in the Abbey of Saint-Étienne and Abbaye aux Dames?
A:
unanswerable