[Q]: Sentence: A 2013 study of Ashkenazi mitochondrial DNA found no significant evidence of Khazar contribution to the Ashkenazi Jewish DNA, as would be predicted by the Khazar hypothesis. Question: What did a 2013 study of Ashkenazi mitochondrial DNA find in regards to the Khazar descent idea?
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[A]: yes

[Q]: Sentence: Zinc metal was not produced on a large scale until the 12th century in India and was unknown to Europe until the end of the 16th century. Question: When was brass first used?
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[A]: no

[Q]: Sentence: Prior to the designation of immunity from the etymological root immunis, which is Latin for "exempt"; early physicians characterized organs that would later be proven as essential components of the immune system. Question: Who originally discovered these parts of the immune system?
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[A]:
yes