The bacteria that retain the stain in Gram’s method of staining is a:

Correct option is B

Ans. (b)
Sol. In Gram staining, Gram-positive bacteria retain the crystal violet stain, appearing purple under the microscope due to their thick peptidoglycan cell wall, which traps the dye. Gram-negative bacteria do not retain the crystal violet and appear pink after counterstaining with safranin.