Litmus is a indicator which is obtained from .

fungi

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natural

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synthetic

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lichens

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Solution

The correct options are
B natural
D lichens
Litmus is a natural indicator which is extracted from lichens. It is a purple coloured dye which is used as a visual indicator to identify acids and bases. Litmus is widely used in form of two types of papers:
1) Red litmus, which turns to blue in basic solution.
2) Blue litmus, which turns to red in acidic solution.

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