Identify the correct statement regarding diseases and immunity.

  • A
    If $B$-lymphocytes and $T$-lymphocytes are damaged for any reason,the body will not produce antibodies against pathogens.
  • B
    Injection of killed/weakened pathogens provides passive immunity.
  • C
    Some protozoans are used to produce the $Hepatitis-B$ vaccine.
  • D
    The injection of antivenom used during a snake bite is an example of active immunity.

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