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    Question

    Counter stain used in gram staining is

    ________.
    A crystal violet Correct Answer Incorrect Answer
    B carbol fuschin Correct Answer Incorrect Answer
    C acitocarmine Correct Answer Incorrect Answer
    D safranin Correct Answer Incorrect Answer

    Solution

    In the last step of the Gram stain, safranin is used as a counterstain to stain transparent cells (Gram-negative cells) pink. The end result is Gram-positive cells that are purple and Gram-negative cells that are pink.

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