Gram-negative bacteria are stained pink by the use of:

Correct answer: D. Safranin

  • A. Crystal violet
  • B. Gram's iodine
  • C. Feulgen stain
  • D. Safranin

Explanation

Option D is correct as gram-negative bacteria are not easily stained by primary dye (crystal violet) so a secondary dye (safranin or fuchsine) is required to dye them a pink or red color.

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