Which of the following statements is incorrect for antibiotics?

  • A
    An antibiotic must be a product of metabolism.
  • B
    An antibiotic is a synthetic substance produced as a structural analogue of naturally occurring antibiotic.
  • C
    An antibiotic should promote the growth or survival of microorganisms.
  • D
    An antibiotic should be effective in low concentrations.

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An antibiotic with a broad spectrum:

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