Which of the following is not a stain?

A. Safranine

B. Iodine

C. Eosin

D. Methylene Blue

Option: B.

Iodine is a solution and used as a component in the staining technique known as Gram staining.

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Eosin is not a stain. 

EOSIN is a counterstain which is applied to give any decolorized bacteria a reddish color to make them more visible.

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