Cyanosis is caused by

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(B) Cyanosis is a condition characterized by a bluish discoloration of the skin and mucous membranes,often caused by a lack of oxygen in the blood.In

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Nitrate concentration

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(B) Cyanosis is a condition characterized by a bluish discoloration of the skin and mucous membranes,often caused by a lack of oxygen in the blood.In the context of environmental pollution,high levels of nitrates in drinking water (often due to agricultural runoff) can lead to methemoglobinemia,also known as 'blue baby syndrome'.In this condition,nitrates are converted to nitrites in the body,which oxidize the iron in hemoglobin from the ferrous $(Fe^{2+})$ state to the ferric $(Fe^{3+})$ state,forming methemoglobin.Methemoglobin cannot bind oxygen effectively,leading to tissue hypoxia and the characteristic cyanotic appearance.

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