Which microorganism is responsible for classical presentation of hydrocephalus, chorioretinitis, intracerebral calcification ?
**Core Concept**
The question tests knowledge of congenital infections, specifically those affecting the central nervous system. **Toxoplasmosis** is a key concept here, caused by the protozoan *Toxoplasma gondii*. This infection can lead to severe neurological and ocular manifestations in congenitally infected individuals.
**Why the Correct Answer is Right**
*Toxoplasma gondii* infection during pregnancy can be transmitted to the fetus, leading to congenital toxoplasmosis. This condition classically presents with a triad of **hydrocephalus**, **chorioretinitis**, and **intracerebral calcification**. The parasite's lifecycle and its ability to form cysts in the brain contribute to these manifestations.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, although it may cause neurological issues, it doesn't classically present with this specific triad.
**Option B:** Incorrect as it's more commonly associated with other types of infections.
**Option C:** Incorrect because it's not typically linked to this combination of symptoms.
**Why Each Wrong Option is Incorrect (Continued)**
**Option D:** Incorrect, as the correct answer is related to *Toxoplasma gondii*, not this option.
**Clinical Pearl / High-Yield Fact**
Remember, congenital toxoplasmosis is a significant cause of neurological and ocular abnormalities in newborns, and its classic presentation includes hydrocephalus, chorioretinitis, and intracerebral calcifications.
**Correct Answer:** D. Toxoplasma gondii