Blue-baby syndrome is caused by

Cadmium pollution

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Mercury poisoning

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Chronic exposure to arsenic

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Excess nitrate in drinking water

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Excess fluoride in drinking water

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Solution

The correct option is D Excess nitrate in drinking water
A blue baby syndrome can be caused by methemoglobinemia. It is caused by nitrate contamination in groundwater resulting in decreased oxygen carrying capacity of haemoglobin in babies leading to death.

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