This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Gram-positive bacteria stain during Gram staining 
Select and explain. 
A. Blue, B. Red, C. Violet, D. Green
C: Violet
Answer: C: Violet 
Explanation: Gram-positive bacteria have a thick mesh-like cell wall made of peptidoglycan, and as a result are stained purple by crystal violet, whereas gram-negative bacteria have a thinner layer, so do not retain the purple stain and are counter-stained pink by safranin or carbol fuchsin. Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 13