[Q]: Sentence: Bulgaria, which was founded around 680, at its height reached from Budapest to the Black Sea and from the Dnieper River in modern Ukraine to the Adriatic Sea. Question: In approximately what year was Bulgaria founded?
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[A]: yes

[Q]: Sentence: Some prominent medical schools have since tightened rules on faculty acceptance of such payments by drug companies. Question: Half of the top earners were mostly in what field?
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[A]: no

[Q]: Sentence: The effective f-number is proportional to the ratio between the lens focal length and aperture diameter, the diameter itself being proportional to the square root of the aperture area. Question: What is the effective f-number proportional to?
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[A]:
yes