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Beer may be stabilised against microbial spoilage after packaging by

  • A.Pasteurisation or sterile filtration
  • B.Adding a fresh charge of live yeast
  • C.Raising the storage temperature sharply
  • D.Aerating the beer vigorously before sealing

Answer: A

Correct answer: Pasteurisation or sterile filtration

Once the beer is in its container the only remaining options are to kill the organisms with heat or to remove them physically through a membrane. Tunnel pasteurisation is the common industrial route; sterile filtration is used where the heat treatment would harm the flavour. Beer conditioned in the bottle deliberately forgoes both.

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