Which one of the following groups belongs to the same category?

  • A
    Polychaeta,Hirudinea,Oligochaeta and Onychophora
  • B
    Holothuroidea,Ophiuroidea,Asteroidea,Echinoidea and Hirudinea
  • C
    Turbellaria,Trematoda and Cestoda
  • D
    Cephalopoda,Gastropoda,Thysanura and Lamellibranchiata

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Describe phylum Platyhelminthes.

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