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What are non-pathogenic bacteria?

  1. Disease-producing bacteria

  2. Bacteria that only live in extreme conditions

  3. Nondisease-producing bacteria

  4. Bacteria found in vaccines

The correct answer is: Nondisease-producing bacteria

Non-pathogenic bacteria are bacteria that do not cause disease in humans or other animals. Option A is incorrect because disease-producing bacteria are known as pathogenic bacteria. Option B is incorrect because non-pathogenic bacteria can also live in moderate conditions. Option D is incorrect because not all bacteria found in vaccines are non-pathogenic. Therefore, the only correct choice is C - nondisease-producing bacteria.