91. Which one of the following is a vital stain
V(A) Janksgreen - B
(C) Methylene blue
(B) Neutral red
(D) All the above
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A is correct answer because
Janus Green B is a basic dye and vital stain used in histology. It is also used to stain mitochondria supravitally, as was introduced by Leonor Michaelis in 1900. The indicator Janus Green B changes colour according to the amount of oxygen present. When oxygen is present, the indicator oxidizes to a blue colour.
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