Q:

Worldwide, the commonest preventable cause of mental retardation in the newborn is

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 Worldwide, the commonest preventable causeof mental retardation in the newborn is:


  1. iodine deficiency
  2. phenylalanine hydroxylase deficiency
  3. cystic fibrosis
  4. urea cycle defect
  5. Down syndrome

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  1. iodine deficiency

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