Problem: A cappella:

Contemporary a cappella includes many vocal groups and bands who add vocal percussion or beatboxing to create a pop/rock/gospel sound, in some cases very similar to bands with instruments. Examples of such professional groups include Straight No Chaser, Pentatonix, The House Jacks, Rockapella, Mosaic, and M-pact. There also remains a strong a cappella presence within Christian music, as some denominations purposefully do not use instruments during worship. Examples of such groups are Take 6, Glad and Acappella. Arrangements of popular music for small a cappella ensembles typically include one voice singing the lead melody, one singing a rhythmic bass line, and the remaining voices contributing chordal or polyphonic accompaniment.

In place of instruments, what do some modern a cappella groups implement?
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A: vocal percussion

Problem: Westminster School and Westminster Abbey Choir School are also in the precincts of the abbey. It was natural for the learned and literate monks to be entrusted with education, and Benedictine monks were required by the Pope to maintain a charity school in 1179. The Choir School educates and trains the choirboys who sing for services in the Abbey.
When were the Benedictine monks required to maintain a charity school?
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Answer: 1179

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The character of the seed coat bears a definite relation to that of the fruit. They protect the embryo and aid in dissemination; they may also directly promote germination. Among plants with indehiscent fruits, in general, the fruit provides protection for the embryo and secures dissemination. In this case, the seed coat is only slightly developed. If the fruit is dehiscent and the seed is exposed, in general, the seed-coat is well developed, and must discharge the functions otherwise executed by the fruit.
What does the embryo in an indehiscent fruit secure?
A: unanswerable

Context and question: Melbourne is also prone to isolated convective showers forming when a cold pool crosses the state, especially if there is considerable daytime heating. These showers are often heavy and can contain hail and squalls and significant drops in temperature, but they pass through very quickly at times with a rapid clearing trend to sunny and relatively calm weather and the temperature rising back to what it was before the shower. This often occurs in the space of minutes and can be repeated many times in a day, giving Melbourne a reputation for having "four seasons in one day", a phrase that is part of local popular culture and familiar to many visitors to the city. The lowest temperature on record is 2.8 C (27.0 F), on 21 July 1869. The highest temperature recorded in Melbourne city was 46.4 C (115.5 F), on 7 February 2009. While snow is occasionally seen at higher elevations in the outskirts of the city, it has not been recorded in the Central Business District since 1986.
What is the lowest temperature on Melbourne's record?
Answer: 2.8 C (27.0 F)

Question: Before the French and Indian War, the Appalachian Mountains laid on the indeterminate boundary between Britain's colonies along the Atlantic and French areas centered in the Mississippi basin. After the French and Indian War, the Proclamation of 1763 restricted settlement for Great Britain's thirteen original colonies in North America to east of the summit line of the mountains (except in the northern regions where the Great Lakes formed the boundary). Although the line was adjusted several times to take frontier settlements into account and was impossible to enforce as law, it was strongly resented by backcountry settlers throughout the Appalachians. The Proclamation Line can be seen as one of the grievances which led to the American Revolutionary War. Many frontier settlers held that the defeat of the French opened the land west of the mountains to English settlement, only to find settlement barred by the British King's proclamation. The backcountry settlers who fought in the Illinois campaign of George Rogers Clark were motivated to secure their settlement of Kentucky.
Is there an answer to this question: When did the French and Indian war begin?

Answer: unanswerable

Problem: Switzerland:

Agricultural protectionisma rare exception to Switzerland's free trade policieshas contributed to high food prices. Product market liberalisation is lagging behind many EU countries according to the OECD. Nevertheless, domestic purchasing power is one of the best in the world. Apart from agriculture, economic and trade barriers between the European Union and Switzerland are minimal and Switzerland has free trade agreements worldwide. Switzerland is a member of the European Free Trade Association (EFTA).

What type of trade agreements does Switzerland have worldwide?
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A:
free