Lungs are an important organ for excretion of

Water.

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Urea.

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Oxygen.

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Carbon dioxide.

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Solution

The correct option is D Carbon dioxide.
Lungs are the respiratory organ, they help in removal of carbon dioxide from our body through the air that we respire. Carbon dioxide is formed during oxidation of food. It is the waste product and of no use of our body. It is carried out to the lungs by blood. So, it may also be considered as an organ that is involved in excretion. Thus, the correct option is D.

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