[Q]: Sentence: Byzantine historiographers under Justinian I (527565), such as Procopius of Caesarea, Jordanes and Theophylact Simocatta describe tribes of these names emerging from the area of the Carpathian Mountains, the lower Danube and the Black Sea, invading the Danubian provinces of the Eastern Empire. Question: The Slavs make their first appearance in Byzantine records when?
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[A]: no

[Q]: Sentence: A consumer price index (CPI) is a measure estimating the average price of consumer goods and services purchased by households. Question: What does CPI stand for?
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[A]: yes

[Q]: Sentence: 2010s saw multiple new sounds in house music developed by numerous DJs. Question: Progressive house blended sounds were prominent in the song "Marry the Night" by what popular artist?
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[A]:
no