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The given figure shows the nephridial system of earthworm and answer the question.

Select the option which shows the correct identification and the function of the structure marked as X.

A. Lateral heart. It is a blood pumping organ.

B. Calciferous glands. They neutralize the humic acid present in humus.

C. Nephridia. It regulates the volume and composition of the body fluids.

D. Blood glands. They produce blood cells and haemoglobin which is dissolved in blood plasma.

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