Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Some systems are capable of multipoint conferencing with no MCU, stand-alone, embedded or otherwise. These use a standards-based H.323 technique known as "decentralized multipoint", where each station in a multipoint call exchanges video and audio directly with the other stations with no central "manager" or other bottleneck. The advantages of this technique are that the video and audio will generally be of higher quality because they don't have to be relayed through a central point. Also, users can make ad-hoc multipoint calls without any concern for the availability or control of an MCU. This added convenience and quality comes at the expense of some increased network bandwidth, because every station must transmit to every other station directly.
What is a main disadvantage of using an MCU technique?
A: unanswerable

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Composers of classical music have often made use of folk music (music created by musicians who are commonly not classically trained, often from a purely oral tradition). Some composers, like Dvorak and Smetana, have used folk themes to impart a nationalist flavor to their work, while others like Bartok have used specific themes lifted whole from their folk-music origins.
What music comes from those commonly trained by oral tradition?
A: folk music

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Non-English terms for air defence include the German Flak (Fliegerabwehrkanone, "aircraft defence cannon", also cited as Flugabwehrkanone), whence English flak, and the Russian term Protivovozdushnaya oborona (Cyrillic: ), a literal translation of "anti-air defence", abbreviated as PVO. In Russian the AA systems are called zenitnye (i.e. "pointing to zenith") systems (guns, missiles etc.). In French, air defence is called DCA (Defense contre les aeronefs, "aeronef" being the generic term for all kind of airborne device (airplane, airship, balloon, missile, rocket, etc.)).
What are the AA systems called in Russian?
A: zenitnye

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In July 2013, Sony Music withdrew from the Greek market due to an economic crisis. Albums released by Sony Music in Greece from domestic and foreign artists are carried by Feelgood Records.
A political crisis caused Sony to withdraw from what market?
A:
unanswerable