For proving the semi conservative mode of replication of $DNA$ , $E-coli$, were first grown in the medium containing ?

  • A

    $^{14}NH_3$

  • B

    $(NH_4)_2 SO_4$

  • C

    $^{15}NH_4CI$

  • D

    $^{14}NH_4CI$

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  • [NEET 2018]