Answer
(b) Gram stain
Work Step by Step
Gram stain is used to classify microorganisms based on their cell wall contents. It uses iodine as a mordant which helps in retaining the stain of certain cells.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.