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B
Cetraria islandica
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C
Rocella tinetoria
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D
Parmelia saxarilis
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Solution
The correct option is CRocella tinetoria The species of the lichen Rocella tinetoria is used for the extraction of the blue dye which serves in the formation of litmus. The litmus papers are used for testing of the pH. The litmus paper turns blue at alkaline pH and red at acidic pH. The change in the pH can be analysed using the litmus papers.