**Core Concept:** HIV (Human Immunodeficiency Virus) is the virus responsible for Acquired Immunodeficiency Syndrome (AIDS). It primarily targets CD4+ T-helper cells, which are a type of white blood cell involved in immune system regulation and response. HIV has a high affinity for CCR5 and CXCR4 chemokine receptors, particularly CCR5, which are expressed on the surface of CD4+ T-helper cells.

**Why the Correct Answer is Right:**
HIV has a predilection for infecting CD4+ T-helper cells due to its interaction with the CCR5 chemokine receptor. The virus hijacks these receptors to enter the host cell, specifically targeting and impairing the immune system. This leads to the weakening of the immune system and the progression of AIDS.

**Why Each Wrong Option is Incorrect:**
A. This option is incorrect because CD4+ T-helper cells are targeted by HIV, not T-suppressor cells.
B. This option is incorrect because HIV primarily infects CD4+ T-helper cells, not B-cells.
C. This option is incorrect because while HIV can infect macrophages, the primary target remains CD4+ T-helper cells.
D. This option is incorrect because while HIV can infect monocytes, the virus primarily targets CD4+ T-helper cells.

**Why Each Wrong Option is Incorrect:**
Option A (B-cells) and Option D (Monocytes) are incorrect because these cells are not the primary target of HIV infection. Option C (Macrophages) is incorrect because although macrophages can be infected, CD4+ T-helper cells are the primary target of HIV. Option D (Monocytes) is incorrect for the same reason. Targeting CD4+ T-helper cells results in a weakened immune system and progression to AIDS.

**Clinical Pearl:**
Understanding the tropism of HIV (its preference for specific cells) is crucial in understanding the pathogenesis of AIDS and developing effective treatments targeting CD4+ T-helper cells and their immune functions.