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B
Ca
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C
P
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D
Na
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Solution
The correct option is B Cu
Exanthema disease is a deficiency symptom of copper in the plant, produced by soil factors and brought about by soil microorganisms, as they attack the roots and produce harmful substances. It causes the yield of gums on the bark and affects fruit bearing capacity of the tree. Dying of the leaves is a major characteristic symptom of exanthema.