Which among the following is the colored powder obtained from lichens, especially Roccella Tinctoria that changes red into acid solution and blue in an alkaline solution ?

Which among the following is the colored powder obtained from lichens, especially Roccella Tinctoria that changes red into acid solution and blue in an alkaline solution ?
[A]Angus Monnex
[B]Dry Powder
[C]Litmus Powder
[D]None of these

Litmus Powder
Litmus is a colored powder, obtained from certain lichens, especially Roccella Tinctoria, that changes to red in an acid solution and to blue in an alkaline solution. Litmus is typically added to paper to make litmus paper, which can be used to determine whether a solution is basic or acidic by dipping a strip of the paper into the solution and seeing how the paper changes color.

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