$P$ (Assertion): The first circulatory system is observed in the phylum Annelida.
$Q$ (Reason): The first true coelom is observed in the phylum Annelida.

  • A
    $P$ and $Q$ are both true,and $P$ is the correct explanation of $Q$.
  • B
    $P$ and $Q$ are both true,but $P$ is not the correct explanation of $Q$.
  • C
    $P$ is true,but $Q$ is false.
  • D
    $P$ is false,but $Q$ is true.

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