**Core Concept**
Coccidioidomycosis, cryptococcosis, and histoplasmosis are fungal infections that can cause meningitis, but the most common fungus responsible for chronic meningitis is Cryptococcus neoformans. This pathogen typically affects immunocompromised individuals, such as those with HIV/AIDS.

**Why the Correct Answer is Right**
Cryptococcus neoformans is a encapsulated yeast that primarily infects the lungs, but can disseminate to the central nervous system (CNS) in immunocompromised hosts. The fungus produces a polysaccharide capsule that evades the host's immune response, allowing it to persist in the CNS and cause chronic meningitis. The infection is characterized by the presence of cryptococcal antigens in the cerebrospinal fluid (CSF) and can be diagnosed using India ink staining or antigen detection assays.

**Why Each Wrong Option is Incorrect**
* **Option A:** Coccidioidomycosis, caused by Coccidioides immitis, typically presents as an acute infection with symptoms such as fever, headache, and chest pain, rather than chronic meningitis.
* **Option B:** Histoplasmosis, caused by Histoplasma capsulatum, can cause meningitis, but it is less common than cryptococcosis in immunocompromised individuals.
* **Option D:** Other fungi, such as Aspergillus and Mucor, can cause CNS infections, but they are more commonly associated with acute or opportunistic infections rather than chronic meningitis.

**Clinical Pearl / High-Yield Fact**
Cryptococcal meningitis is a leading cause of morbidity and mortality in HIV/AIDS patients, highlighting the importance of early diagnosis and antifungal treatment in this population.

**Correct Answer: C. Cryptococcus neoformans**