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Oxygen picked up at packaging harms beer chiefly by

  • A.Converting the alcohol back into fermentable sugar again
  • B.Causing staling and allowing aerobic spoilage organisms to grow
  • C.Making the packaged beer far more bitter than was intended
  • D.Removing the carbon dioxide already dissolved in the beer

Answer: B

Dissolved oxygen drives oxidation reactions that give cardboard and sherry-like staling flavours, and it also permits aerobic organisms that the anaerobic beer would otherwise exclude. Modern packaging works hard to keep pick-up to a minimum.

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