Problem: Bird:

Most birds can fly, which distinguishes them from almost all other vertebrate classes. Flight is the primary means of locomotion for most bird species and is used for breeding, feeding, and predator avoidance and escape. Birds have various adaptations for flight, including a lightweight skeleton, two large flight muscles, the pectoralis (which accounts for 15% of the total mass of the bird) and the supracoracoideus, as well as a modified forelimb (wing) that serves as an aerofoil. Wing shape and size generally determine a bird species' type of flight; many birds combine powered, flapping flight with less energy-intensive soaring flight. About 60 extant bird species are flightless, as were many extinct birds. Flightlessness often arises in birds on isolated islands, probably due to limited resources and the absence of land predators. Though flightless, penguins use similar musculature and movements to "fly" through the water, as do auks, shearwaters and dippers.

How many large flight muscles do birds have?
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A: two

Problem: Some of the best-known traditions, including carnal parades and masquerade balls, were first recorded in medieval Italy. The carnival of Venice was, for a long time, the most famous carnival (although Napoleon abolished it in 1797 and only in 1979 was the tradition restored). From Italy, Carnival traditions spread to Spain, Portugal and France and from France to New France in North America. From Spain and Portugal it spread with colonization to the Caribbean and Latin America. In the early 19th century in the German Rhineland and Southern Netherlands, the weakened medieval tradition also revive. Continuously in the 18th and 19th centuries CE, as part of the annual Saturnalia abuse of the carnival in Rome, rabbis of the ghetto were forced to march through the city streets wearing foolish guise, jeered upon and pelted by a variety of missiles from the crowd. A petition of the Jewish community of Rome sent in 1836 to Pope Gregory XVI to stop the annual anti-semitic Saturnalia abuse got a negation: "It is not opportune to make any innovation."
What city's carnival was the most famous for a long time?
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Answer: Venice

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Other widely used alloys that contain zinc include nickel silver, typewriter metal, soft and aluminium solder, and commercial bronze. Zinc is also used in contemporary pipe organs as a substitute for the traditional lead/tin alloy in pipes. Alloys of 8588% zinc, 410% copper, and 28% aluminium find limited use in certain types of machine bearings. Zinc is the primary metal used in making American one cent coins since 1982. The zinc core is coated with a thin layer of copper to give the impression of a copper coin. In 1994, 33,200 tonnes (36,600 short tons) of zinc were used to produce 13.6 billion pennies in the United States.
Zinc, copper and aluminum alloys have use in what part of machinery?
A: machine bearings

Context and question: Tajikistan means the "Land of the Tajiks". The suffix "-stan" (Persian: -stan) is Persian for "place of" or "country" and Tajik is, most likely, the name of a pre-Islamic (before the seventh century A.D.) tribe. According to the Library of Congress's 1997 Country Study of Tajikistan, it is difficult to definitively state the origins of the word "Tajik" because the term is "embroiled in twentieth-century political disputes about whether Turkic or Iranian peoples were the original inhabitants of Central Asia."
What is most likely the name of a pre-Indian tribe?
Answer: unanswerable

Question: Standard Chinese (Mandarin) has stops and affricates distinguished by aspiration: for instance, /t t/, /ts ts/. In pinyin, tenuis stops are written with letters that represent voiced consonants in English, and aspirated stops with letters that represent voiceless consonants. Thus d represents /t/, and t represents /t/.
Is there an answer to this question: What is written with letter that represent voiced consonants?

Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The landing was north of Sevastopol, so the Russians had arrayed their army in expectation of a direct attack. The allies advanced and on the morning of 20 September came up to the Alma river and the whole Russian army. The position was strong, but after three hours,:424 the frontal attack had driven the Russians out of their dug in positions with losses of 6000 men. The Battle of the Alma had 3,300 Allied losses. Failing to pursue the retreating forces was one of many strategic errors made during the war, and the Russians themselves noted that had they pressed south that day they would have easily captured Sevastopol.
How many men did the Russians lose after three hours?
A:
6000 men