The $SCID$ patient has a defective gene for the enzyme Adenosine Deaminase $(ADA)$. He/She lacks functional ...... and therefore,fails to fight the infecting pathogens.

  • A
    $B-$lymphocytes
  • B
    Phagocytes
  • C
    $T-$lymphocytes
  • D
    Both $(a)$ and $(b)$

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