**Core Concept**
The Millennium Development Goals (MDGs) were a set of eight objectives agreed upon by the United Nations to address global poverty, health, and other development challenges. In the context of HIV/AIDS, the MDGs aimed to reduce the prevalence of the disease and improve access to treatment and care.

**Why the Correct Answer is Right**
The MDG specifically targeting HIV/AIDS was MDG 6, which aimed to halt and begin to reverse the spread of HIV/AIDS by 2015. This goal was achieved through a combination of interventions, including the expansion of antiretroviral therapy (ART) coverage, prevention of mother-to-child transmission (PMTCT), and promotion of safe sex practices. The success of MDG 6 was largely due to the efforts of global health organizations, governments, and civil society in implementing these interventions.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because there is no MDG specifically focused on tuberculosis (TB). While TB is a significant public health concern, it was not a primary focus of the MDGs.
* **Option B:** This option is incorrect because MDG 5 focused on improving maternal health, with targets related to reducing maternal mortality and increasing access to reproductive health services.
* **Option C:** This option is incorrect because MDG 4 focused on reducing child mortality, with targets related to reducing the under-five mortality rate and improving access to healthcare for children.

**Clinical Pearl / High-Yield Fact**
One key takeaway from the MDGs is that global health goals can be achieved through concerted efforts by governments, organizations, and civil society. The success of MDG 6 in reducing the spread of HIV/AIDS demonstrates the importance of coordinated action in addressing global health challenges.

**Correct Answer:** D.