All are true about cryptococcus except -a) Polysaccharide capsuleb) Reproduces by buddingc) Pseudohyphaed) Mycelium have a narrow base

**Core Concept**
Cryptococcus is a genus of fungi that includes species such as Cryptococcus neoformans, which is an opportunistic pathogen that causes cryptococcosis, primarily in immunocompromised individuals. The organism's polysaccharide capsule is a key virulence factor.

**Why the Correct Answer is Right**
The correct answer involves understanding the characteristics of Cryptococcus. Cryptococcus reproduces by budding, which is a unique feature of this organism. The polysaccharide capsule is indeed a critical virulence factor, as it helps the organism evade the host's immune system. Pseudohyphae are associated with other fungal pathogens like Candida, not Cryptococcus. Cryptococcus exhibits a characteristic "halo" or capsule around the yeast cells under the microscope.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is incorrect because the polysaccharide capsule is indeed a characteristic of Cryptococcus, particularly C. neoformans.
* **Option C:** This is incorrect because Cryptococcus does not form pseudohyphae; it reproduces by budding.
* **Option D:** This is incorrect because Cryptococcus does not have mycelium with a narrow base; it exists as a yeast cell.

**Clinical Pearl / High-Yield Fact**
Cryptococcus neoformans can cause life-threatening meningitis in immunocompromised individuals, particularly those with HIV/AIDS. The organism's polysaccharide capsule is a major virulence factor, and its presence can be detected using the India ink stain.

**Correct Answer:** C. Pseudohyphae