Impoant features of AIDS are –
**Core Concept**
The Acquired Immunodeficiency Syndrome (**AIDS**) is a condition caused by the Human Immunodeficiency Virus (**HIV**), characterized by a weakened immune system. **CD4+ T cells** are the primary targets of HIV, leading to impaired immune function. This results in increased susceptibility to opportunistic infections and certain types of cancer.
**Why the Correct Answer is Right**
Since the correct answer is not specified, let's discuss key features of AIDS: **opportunistic infections**, **cancer**, and **neurological disorders**. HIV infects and destroys **CD4+ T cells**, leading to a compromised immune system. This allows opportunistic pathogens to cause infections, such as **Pneumocystis jirovecii pneumonia** and **Toxoplasmosis**.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific text, we cannot determine why this option is incorrect, but typically, options that do not include key features of AIDS, such as immune system dysfunction or common opportunistic infections, are incorrect.
**Option B:** Similarly, without the text, it's challenging to assess, but options that do not acknowledge the role of **HIV** in causing AIDS or the significance of **CD4+ T cell depletion** are usually incorrect.
**Option C:** This option would be incorrect if it fails to mention critical aspects of AIDS, such as the increased risk of **certain cancers**, like **Kaposi's sarcoma**.
**Option D:** If this option does not discuss the **clinical manifestations** of AIDS, including **weight loss**, **diarrhea**, and **neurological symptoms**, it would be incorrect.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that AIDS is characterized by a **CD4+ T cell count below 200 cells/μL**, indicating severe immune system compromise. This is a critical threshold for diagnosing AIDS in HIV-infected individuals.
**Correct Answer:**