Assertion $A$: For an $AIDS$ patient,it becomes impossible to protect against infections from various diseases.
Reason $R$: $HIV$ infection leads to a decrease in the number of helper $T$-lymphocytes in the body.
Which option is correct for Assertion $A$ and Reason $R$?

  • A
    $A$ and $R$ both are true and $R$ is the correct explanation of $A$.
  • B
    $A$ and $R$ both are true but $R$ is not the correct explanation of $A$.
  • C
    $A$ is true and $R$ is false.
  • D
    $A$ is false and $R$ is true.

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