A type of manmade radiation include

Bricks

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Soil

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Radon

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Rocks

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Solution

The correct option is A Bricks
Soil , Radon and Rocks are available in the nature , they are not man made . So the radiations from them are natural
Bricks are not available in nature , It is man made . So the radiations from bricks are man made radiations
Therefore option $A$ is correct

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