Priyanka is a microbiologist, she used a staining reagent to diagnose cryptococcosis. Identify the staining reagent.

Methylene blue

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Crystal violet

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Malachite green

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Alcian blue

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Solution

The correct option is A Alcian blue
Cryptococcus is a pathogenic fungus that is encapsulated. Alcian blue is a dye that is used for detecting this polysaccharide capsule. It stains the capsule blue that can be seen under a compound microscope. Hence Priyanka used Alcian blue as a staining reagent to diagnose cryptococcosis. Thus the correct answer is option D.

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