Discussion
Blue baby syndrome (due to formation of non-functional met-hemoglobin) is due to
Answer: D
Blue baby syndrome is caused by excess of nitrates in drinking water.
In infants, nitrate is converted to nitrite, which oxidises the iron of haemoglobin to form methaemoglobin. Methaemoglobin cannot carry oxygen, so the baby's skin turns bluish (methaemoglobinaemia). The usual source is groundwater polluted by fertilisers and sewage.
Excess arsenic causes skin lesions and cancers, iron deficiency causes anaemia, and atmospheric methane is a greenhouse gas with no link to the syndrome.
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