**Core Concept**
In the context of AIDS, the central nervous system (CNS) can be affected by various opportunistic infections and neoplasms due to the compromised immune system. The CNS is a protected environment, but certain pathogens can still infiltrate and cause disease.

**Why the Correct Answer is Right**
To answer this question, we need to consider the typical pathogens found in the CNS of AIDS patients. Cytomegalovirus (CMV) is a common cause of CNS infection in immunocompromised individuals, particularly in those with AIDS. Toxoplasmosis, caused by *Toxoplasma gondii*, is another well-known CNS infection in AIDS patients. Progressive multifocal leukoencephalopathy (PML), caused by the JC virus, is a rare but serious CNS disease seen in patients with AIDS. On the other hand, *Mycobacterium tuberculosis* (MTB) typically causes extrapulmonary tuberculosis, including CNS tuberculosis, in immunocompromised individuals.

**Why Each Wrong Option is Incorrect**
* **Option A:** Not specified, cannot evaluate.
* **Option B:** Typically, CNS involvement in AIDS includes CMV, Toxoplasmosis, and PML; MTB is a less common cause.
* **Option C:** MTB can cause CNS tuberculosis in AIDS patients.
* **Option D:** MTB is an opportunistic pathogen that can cause CNS disease in immunocompromised individuals.

**Clinical Pearl / High-Yield Fact**
In AIDS patients, CNS infections can be caused by a variety of pathogens, but CMV, Toxoplasmosis, and PML are more common. MTB can also cause CNS disease, but it is less frequent.

**Correct Answer: D. MTB**