A) Antibody molecule
B) T- helper cell
C) Bone- marrow cells
D) T- cytotoxic cell
Correct Answer: B
Solution :
AIDS is caused due to infection of Human Immunodeficiency Virus (HIV). AIDS is characterized by reduction in the number of \[C{{D}^{4}}\]or helper \[{{T}^{4}}-\] lymphocytes, as HIV kills these cells.
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