The Black-foot disease is caused by the contamination of ________ in drinking water.

Black-foot disease is caused by arsenic contamination of drinking water.

Cadmium poisoning causes itai-itai disease with bone and kidney damage, not black-foot.

Mercury causes nerve damage and Minamata disease rather than black-foot.

Lead harms the blood and brain but does not cause black-foot disease.

Long-term arsenic in water damages blood vessels in the feet, leading to gangrene and blackening.

Arsenic-tainted groundwater is a serious problem in parts of West Bengal and Bangladesh.