Thirty percent of the bases in a sample of $DNA$ extracted from eukaryotic cells is adenine. What percentage of cytosine is present in this $DNA$ ?

  • [AIIMS 2015]
  • A

    $10\%$

  • B

    $20\%$

  • C

    $30\%$

  • D

    $40\%$

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  • [AIPMT 2008]

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