The primary target of HIV in humans is
A{'text': 'B lymphocytes only through Ig receptors', 'label': 'A'}
B{'text': 'Platelets involved in clot formation', 'label': 'B'}
C{'text': 'Erythrocytes carrying oxygen in blood', 'label': 'C'}
D{'text': 'Helper T lymphocytes with CD4 receptors', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Helper T lymphocytes with CD4 receptors', 'label': 'D'}
1. HIV binds the CD4 receptor on the surface of helper T lymphocytes.
2. The progressive loss of helper T cells cripples adaptive immunity.
3. Individuals then become vulnerable to opportunistic infections and cancers.
4. Full-blown AIDS is diagnosed when the CD4 count drops below a threshold.
_Source: NCERT Class 12 Biology, Ch 7 "Human Health and Disease", §7.3_
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