**Core Concept**
The question is testing knowledge on the pathophysiology of HIV infection, specifically the mechanisms by which HIV causes disease. HIV (Human Immunodeficiency Virus) is a lentivirus that targets and depletes CD4+ T lymphocytes, leading to immunosuppression and increased susceptibility to opportunistic infections.

**Why the Correct Answer is Right**
HIV infection leads to the depletion of CD4+ T lymphocytes through direct killing and indirect mechanisms. HIV enters CD4+ T cells by binding to the CD4 receptor and a co-receptor, usually CCR5 or CXCR4. Once inside, the virus integrates into the host genome and utilizes host cellular machinery to replicate. As HIV replicates, it induces apoptosis (programmed cell death) in infected cells, further depleting the CD4+ T cell pool. Additionally, HIV can also induce the death of uninfected CD4+ T cells through bystander apoptosis, further exacerbating immunosuppression.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while HIV does cause immunosuppression, it does not primarily target B lymphocytes. HIV's primary target is CD4+ T lymphocytes.
**Option B:** This option is incorrect because while HIV does cause apoptosis in infected cells, it is not primarily through the induction of necrosis. Necrosis is a form of cell death that is often caused by physical injury or infection, whereas apoptosis is a more regulated process.
**Option C:** This option is incorrect because while HIV does integrate into the host genome, it does not primarily utilize host cellular machinery to replicate by inducing autophagy. Autophagy is a cellular process that involves the breakdown and recycling of cellular components, which is not directly related to HIV replication.

**Clinical Pearl / High-Yield Fact**
A key clinical correlation to remember is that HIV infection can lead to immunosuppression, making patients susceptible to opportunistic infections such as Pneumocystis jirovecii pneumonia (PCP) and Mycobacterium avium complex (MAC) disease.

**Correct Answer:** C.

✓ Correct Answer: A. Following needle stick injury HIV transmission can be reduced by administration of nucleoside analogues