Which of the following statements is correct regarding immunity?

  • A
    Injection of preformed antibodies is required for the treatment of viper snake bites.
  • B
    $T$-lymphocytes produce antibodies against smallpox pathogens.
  • C
    Antibodies are protein molecules consisting of four light chains.
  • D
    Rejection of a transplanted kidney is the function of $B$-lymphocytes.

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