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The Korean War was a conflict between the United States and its United Nations allies and the communist powers under influence of the Soviet Union (also a UN member nation) and the People's Republic of China (which later also gained UN membership). The principal combatants were North and South Korea. Principal allies of South Korea included the United States, Canada, Australia, the United Kingdom, although many other nations sent troops under the aegis of the United Nations. Allies of North Korea included the People's Republic of China, which supplied military forces, and the Soviet Union, which supplied combat advisors and aircraft pilots, as well as arms, for the Chinese and North Korean troops.
What country was the principal ally of South Korea during the war?
A: the United States

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The metro leaves the Rodoviaria (bus station) and goes south, avoiding most of the political and tourist areas. The main purpose of the metro is to serve cities, such as Samambaia, Taguatinga and Ceilandia, as well as Guara and Aguas Claras. The satellite cities served are more populated in total than the Plano Piloto itself (the census of 2000 indicated that Ceilandia had 344,039 inhabitants, Taguatinga had 243,575, whereas the Plano Piloto had approximately 400,000 inhabitants), and most residents of the satellite cities depend on public transportation.
What tourist areas does the metro serve?
A: unanswerable

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On December 30, 1922, the First Congress of the Soviets of the USSR approved the Treaty on the Creation of the USSR, by which Russia was united with the Ukrainian Soviet Socialist Republic, Byelorussian Soviet Socialist Republic, and Transcaucasian Soviet Federal Socialist Republic into a single federal state, the Soviet Union. Later treaty was included in the 1924 Soviet Constitution,[clarification needed] adopted on January 31, 1924 by the Second Congress of Soviets of the USSR.
On what date was the 1942 Soviet Constitution adopted?
A: unanswerable

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Some forms of Greek before the Koine Greek period are reconstructed as having aspirated stops. The Classical Attic dialect of Ancient Greek had a three-way distinction in stops like Eastern Armenian: /t t d/. These stops were called , , "thin, thick, middle" by Koine Greek grammarians.
Who referred to the Classical Attic dialect stops by the three distinctions?
A:
Greek grammarians