In Escherichia coli, lac operon is induced by

  • A

    $lactose$

  • B

    $promotor\; gene$

  • C

    $b-galactosidase$

  • D

    $I-gene$

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  • [NEET 2024]

In the medium where $E$. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down some time after addition of lactose in the medium?