How does the structure of peptidoglycan affect the gram-staining process?

• A. Gram-positive bacteria retain the stain due to their thick peptidoglycan layer.
• B. Both gram-positive and gram-negative bacteria retain the stain equally.
• C. Gram-negative bacteria retain the stain due to their thick peptidoglycan layer.
• D. Peptidoglycan structure does not affect the gram-staining process.

Answer: (A)