Select the correct statement from the following.

  • A
    $RNA$ consists of two polynucleotide chains.
  • B
    Both strands of $DNA$ are coiled together in a specific manner.
  • C
    In the structure of two polynucleotides,purines are paired with purines and pyrimidines with pyrimidines.
  • D
    The distance between the two strands of $DNA$ is $34 \ \mathring A$.

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