In $Pheretima$,nephridia occur in:

  • A
    All segments except $1-3$ and the last segment
  • B
    $1-2, 4-6, 15$ to last segments
  • C
    Meganephridia in pre-clitellar and micronephridia in post-clitellar segments
  • D
    Micronephridia in all segments,meganephridia from clitellar region to end

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