$S$ - Statement: The presence of $Zn$ is essential for the activity of carbonic anhydrase.
$R$ - Reason: The presence of vanadium is essential for the activity of nitrogenase.

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

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