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Black-foot disease is caused due to ground water contaminated with excess of

1. Nitrate
2. Fluoride
3. Arsenic
4. sulphur E. Mercury

Correct answer: Arsenic

Solution

Black-foot disease is a form of peripheral vascular disease caused by chronic arsenic exposure through contaminated groundwater. Arsenic damages blood vessels and tissues, leading to ischemia and the characteristic blackening of the feet.

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