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Methemoglobinemia (blue baby syndrome) in infants is caused by drinking water containing excess:

  1. Aphosphate
  2. Bnitrate
  3. Ccadmium
  4. Dfluoride

Answer: B

Nitrate above the permitted 50 ppm is reduced to nitrite in the gut. Nitrite converts haemoglobin to methemoglobin, which cannot carry oxygen.
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