## **Core Concept**
Cutaneous Larva currens is a skin condition caused by the migration of larvae of certain nematodes through the skin. It is characterized by rapidly moving, thread-like lesions that result from the larvae penetrating the skin. This condition is often associated with parasitic infections.

## **Why the Correct Answer is Right**
The correct answer, **D. Strongyloides stercoralis**, is right because Strongyloides stercoralis, also known as threadworm, is a parasitic nematode that causes strongyloidiasis. One of the clinical manifestations of strongyloidiasis is cutaneous larva currens, which occurs when the filariform larvae of the parasite penetrate the skin, typically through the feet or other parts of the body that come into contact with contaminated soil. This condition is marked by the rapid movement of the larvae under the skin, creating the characteristic thread-like lesions.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it is not specified, but commonly, cutaneous larva migrans is associated with hookworms (e.g., Ancylostoma braziliense), not typically described as larva currens.
- **Option B:** This option is incorrect as it is not provided, but conditions like onchocerciasis cause different skin and eye manifestations.
- **Option C:** This option is incorrect as it is not given, but other parasites may cause different types of skin lesions or conditions.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that cutaneous larva currens is a distinctive feature of strongyloidiasis, caused by **Strongyloides stercoralis**. This condition can occur in individuals with a history of traveling to or immigrating from endemic areas and is a critical diagnosis to consider in patients with suggestive skin lesions and relevant exposure history.

## **Correct Answer:** D. Strongyloides stercoralis.