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      Question

      How long does it take to pasteurize milk at 72°C

      (172°F)? 
      A 16 seconds Correct Answer Incorrect Answer
      B 16 minutes Correct Answer Incorrect Answer
      C 16 hours Correct Answer Incorrect Answer
      D 16 days Correct Answer Incorrect Answer

      Solution

      High-Temperature Short-Time (HTST) pasteurization requires heating milk to 72°C for 15-20 seconds (typically standardized to 16 seconds). This kills pathogenic bacteria while preserving milk quality. Longer durations (minutes/hours) would degrade nutrients, and lower temperatures would be ineffective.

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