Problem: What was the first name of British Field Marshall Kitchener, who played a central role in the early part of the First World War?
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A: horatio

Problem: Which fruit is traditionally used in the recipe for Liverpool Tart?
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A: lemon

Problem: In 1727, Janet Horne became the last British person to be executed for what crime?
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A: witchcraft

Problem: What was invented by James Dewer in 1872?
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A:
vacuum or thermos flask