Which are the complementary bases in $DNA$?

  • A
    Uracil and Adenine,Cytosine and Guanine
  • B
    Adenine and Thymine,Guanine and Cytosine
  • C
    Adenine and Thymine,Guanine and Uracil
  • D
    Adenine and Guanine,Thymine and Cytosine

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