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Which statement about carbon dioxide in these fermentations is correct?

  • A.It is retained under pressure in beer and sparkling wine
  • B.It is retained in a still wine and vented away from beer
  • C.It is produced only by bacteria and never at all by yeast
  • D.It is added to the must before the fermentation begins

Answer: A

Both beer and sparkling wine keep the gas dissolved under pressure, while still wine is allowed to vent it. The gas comes from yeast fermenting sugar, though lactic acid bacteria produce some in the malolactic step as well.

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