Multiple choice

____ is not used to stain fats.

  1. Oil red O

  2. Congo red

  3. Sudan III

  4. Sudan black
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oil Red O, Sudan III, and Sudan Black are all fat-soluble dyes used to stain neutral lipids and triglycerides in tissue sections. Congo Red is an amyloid stain that binds to beta-pleated sheet structures, making it useful for identifying amyloid deposits. It is not used for staining fats.

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