Assertion :Janus green, methylene blue and neutral red are called vital stains. Reason: They stain the cell organelles without killing the cell.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Vital staining is a technique in which harmless dye is used to stain living tissue for microscopic observations. The stain may be injected into a living animal and the stained tissue removed and examined or the living tissue may be removed directly and subsequently stained. Vital stains include trypan blue, vital red and Janus green (where the latter is especially suitable for observing mitochondria).

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