In human female, barr bodies are formed by

  • [AIPMT 1996]
  • A

    Inactivation of mother's $X$ chromosome

  • B

    Inactivation of father's $X$ chromosome

  • C

    Inactivation of both mother's and father's $X$ chromosomes

  • D

    Inactivation of either mother's or father's $X$ chromosome

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