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# Which of the following is an antiseptic dyes?

$(a)\;\text{Methylene Blue} \\ (b)\;\text{Indigo} \\(c)\;\text{Malachite green} \\ (d)\;\text{Malachite green}$

Many organic dyes have a very strongantisepic action.
Gentian violet and methylene blue are examples of anti sepectic dyes.
There are used for dressing of wounds and in the treatment of various other skin diseases.
Hence a is the correct answer.