(A) The blue dye, commonly known as indigo, is obtained from the leaves of the plant $Indigofera$ $tinctoria$. This plant belongs to the family $Fabac

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(A) The blue dye, commonly known as indigo, is obtained from the leaves of the plant $Indigofera$ $tinctoria$. This plant belongs to the family $Fabaceae$. The process involves fermenting the leaves to extract the pigment, which is then used for dyeing fabrics.