How is acid-fast staining used for Mycobacteria?

• A. Ziehl-Neelsen or Kinyoun stain detects mycolic acids in cell walls; acid-fast organisms retain primary stain after acid-alcohol decolorization.
• B. It stains all bacteria equally.
• C. It is used to distinguish Gram-negative from Gram-positive.
• D. It detects capsules.

Answer: (A)