Which one of the following statements pertaining to pollutants is correct?

  • A
    $DDT$ is a non-biodegradable pollutant.
  • B
    Excess fluoride in drinking water causes fluorosis, hardening of bones, and stiff joints.
  • C
    Excess cadmium in drinking water causes Itai-Itai disease.
  • D
    Methylmercury in water may cause Minamata disease.

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