**Core Concept**
Cryptococcus is a type of encapsulated yeast that primarily affects immunocompromised individuals, particularly those with HIV/AIDS. It has a predilection for specific tissues and organs due to its pathogenic properties.

**Why the Correct Answer is Right**
Cryptococcus neoformans has a strong affinity for the central nervous system (CNS), particularly the cerebrospinal fluid (CSF) and meninges. This is due to its ability to adhere to and invade the epithelial cells lining the respiratory tract, leading to the formation of cryptococcomas in the CNS. The organism's polysaccharide capsule also plays a crucial role in its virulence and ability to evade the host immune response.

**Why Each Wrong Option is Incorrect**
**Option A:** Cryptococcus does not have a predilection for the liver, as it is not typically associated with liver infections.
**Option B:** Although Cryptococcus can cause systemic infections, it does not have a specific predilection for the kidneys.
**Option C:** Cryptococcus is not known to have a specific affinity for the gastrointestinal tract.

**Clinical Pearl / High-Yield Fact**
It is essential to note that Cryptococcal meningitis is a medical emergency, and prompt diagnosis and treatment are crucial to prevent mortality.

**Correct Answer: D. CNS**